var checkobj
function agreesubmit(el){
checkobj=el
if (document.all||document.getElementById){
for (i=0;i<checkobj.form.length;i++){  
var tempobj=checkobj.form.elements[i]
if(tempobj.type.toLowerCase()=="submit")
tempobj.disabled=!checkobj.checked
}
}
}
function defaultagree(el){
if (!document.all&&!document.getElementById){
if (window.checkobj&&checkobj.checked)
return true
else{
alert("Lees eerst de voorwaarden en ga ermee akkoord!")
return false
}
}
}

function Comma(number) {
number = '' + number;
if (number.length > 2) {
var mod = number.length % 2;
var output = (mod > 0 ? (number.substring(0,mod)) : '');
for (i=0 ; i < Math.floor(number.length / 2); i++) {
if ((mod == 0) && (i == 0))
output += number.substring(mod+ 3 * i, mod + 3 * i + 2);
else
output+= ',' + number.substring(mod + 3 * i, mod + 3 * i + 2);
}
return (output);
}
else return number;
}