function validate_create() {
        //f=document.forms;
        var re=/^[A-Za-z0-9._-]+@[a-zA-Z0-9-][a-zA-Z0-9.-]*.[a-zA-Z0-9]{2,3}$/;
        if(!f.email.value.match(re)) {
                alert('You did not enter a valid email address');
                return false;
        }
        if(f.password1.value.length < 4) {
                alert('You need to enter a password that is at least four characters long');
                return false;
        }
        if(f.password1.value != f.password2.value) {
                alert('You entered two different passwords.');
                return false;
        }
        if(!f.use.checked) {
                alert('You need to agree to the mensus.net terms of use');
                return false;
        }
        if(!f.privacy.checked) {
                alert('You need to read mensus.net\'s privacy policy.');
                return false;
        }
        return true;
}

function validate_chemail() {
        //f=document.forms;
        var re=/^[A-Za-z0-9._-]+@[a-zA-Z0-9-][a-zA-Z0-9.-]*.[a-zA-Z0-9]{2,3}$/;
        if(!f.email.value.match(re)) {
                alert('You did not enter a valid email address');
                return false;
        }
        if(f.password.value.length < 4) {
                alert('You need to enter your current password');
                return false;
        }
        return true;
}

function validate_chpw() {
        //f=document.forms;
        if(fp.password.value.length < 4) {
                alert('You need to enter your current password');
                return false;
        }
        if(fp.passwordn1.value.length < 4) {
                alert('Your new password must be at least 4 characters long ');
                return false;
        }
        if(fp.passwordn2.value != fp.passwordn1.value) {
                alert('You did not enter the same password twice.');
                return false;
        }
        return true;
}

function res_to_white() {
        for(var i=0;document.getElementById("res"+i);i++) {
                document.getElementById("res"+i).style.backgroundColor='white';
        }
}

function logic_clear() {
        for(var a=0;a<logic_attrs;a++) {
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                document.getElementById("B"+a+i+h).checked=false;
                                document.getElementById("C"+a+i+h).style.backgroundColor='white';
                        }
                }
        }
}
function logic_set() {
        for(var a=0;a<logic_attrs;a++) {
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                document.getElementById("B"+a+i+h).checked=true;
                                document.getElementById("C"+a+i+h).style.backgroundColor='yellow';
                        }
                }
        }
}
function logic_cl(c) {
        if(document.getElementById("CL"+c).checked) {
                document.getElementById("CLS"+c).style.color='gray';
                document.getElementById("CLS"+c).style.textDecoration='line-through';
        } else {
                document.getElementById("CLS"+c).style.color='black';
                document.getElementById("CLS"+c).style.textDecoration='none';
        }
}
function logic_init() {
        logic_items=new Array();
        for(var i=0;i<logic_res.length;i++) {
                logic_items[logic_res[i]-1000]=1;
        }
        //alert("logic_attrs: "+logic_attrs);
        //alert("logic_size: "+logic_size);
        for(var a=0;a<logic_attrs;a++) {
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                //if(a==1 && i==1 && h==1) alert("C"+a+i+h);
                                document.getElementById("C"+a+i+h).style.backgroundColor='white';
                                document.getElementById("B"+a+i+h).checked=false;
                        }
                }
        }
}

//logic_initialized=false;
function logic_click(n) {
        //if(!logic_initialized) {
                //var a=document.getElementById("B"+n).checked;
                //logic_init();
                //document.getElementById("B"+n).checked=a;
                //logic_initialized=true;
        //}
        var attr=n.substr(0,1);
        var sel=n.substr(1,1);
        var house=n.substr(2,1);
        //alert("click on "+n+" - "+document.getElementById("B"+n).checked);
        var items=new Array();
        var houses=new Array();
        for(var i=0;i<logic_size;i++) {
                items[i]=-1;
                houses[i]=-1;
        }
        for(var i=0;i<logic_size;i++) {
                for(var h=0;h<logic_size;h++) {
                        if(document.getElementById("B"+attr+i+h).checked) {
                                if(items[i]==-1) items[i]=h;
                                else items[i]=-2;
                                if(houses[h]==-1) houses[h]=i;
                                else houses[h]=-2;
                                document.getElementById("C"+attr+i+h).style.backgroundColor='yellow';
                        } else {
                                document.getElementById("C"+attr+i+h).style.backgroundColor='white';
                        }
                }
        }
        for(var i=0;i<logic_size;i++) {
                for(var h=0;h<logic_size;h++) {
                        if(houses[h]>=0 && items[houses[h]]>=0 || items[i]>=0 && houses[items[i]]>=0) {
                                document.getElementById("C"+attr+i+h).style.backgroundColor='#aaaaff';
                        }
                }
        }
}

var logic_spoiled=false;
function logic_check() {
        if(logic_spoiled==false && !confirm("Do you want to proceed, get hints and spoil the fun?")) return;
        logic_spoiled=true;
        for(var a=0;a<logic_attrs;a++) {
                var items=new Array();
                var houses=new Array();
                for(var i=0;i<logic_size;i++) {
                        items[i]=-1;
                        houses[i]=-1;
                }
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                if(document.getElementById("B"+a+i+h).checked) {
                                        if(logic_items[a*100+i*10+h]==0) {
                                                items[i]=-2;
                                                houses[h]=-2;
                                        }
                                        if(items[i]==-1) items[i]=h;
                                        else items[i]=-2;
                                        if(houses[h]==-1) houses[h]=i;
                                        else houses[h]=-2;
                                } else {
                                        if(logic_items[a*100+i*10+h]==1) {
                                                items[i]=-2;
                                                houses[h]=-2;
                                        }
                                }
                                document.getElementById("C"+a+i+h).style.backgroundColor='red';
                        }
                }
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                if(houses[h]>=0 && items[houses[h]]>=0 || items[i]>=0 && houses[items[i]]>=0) {
                                        document.getElementById("C"+a+i+h).style.backgroundColor='#aaffaa';
                                }
                        }
                }
        }
}

function logic_ok() {
        var error=false;
        for(var a=0;a<logic_attrs && !error;a++) {
                for(var i=0;i<logic_size && !error;i++) {
                        for(var h=0;h<logic_size && !error;h++) {
                                if(document.getElementById("B"+a+i+h).checked) {
                                        if(logic_items[a*100+i*10+h]==0) {
                                                error=true;
                                        }
                                } else {
                                        if(logic_items[a*100+i*10+h]==1) {
                                                error=true;
                                        }
                                }
                        }
                }
        }
        if(error) {
                alert("Unforunately the solution is incomplete and/or wrong.");
                return;
        }
        for(var a=0;a<logic_attrs;a++) {
                for(var i=0;i<logic_size;i++) {
                        for(var h=0;h<logic_size;h++) {
                                if(logic_items[a*100+i*10+h]==1) {
                                        document.getElementById("C"+a+i+h).style.backgroundColor='green';
                                } else {
                                        document.getElementById("C"+a+i+h).style.backgroundColor='white';
                                }
                        }
                }
        }
        alert("Congratulations!");
}