// mailto:
function mailTo(nameVar, domainVar) {
    document.write('<a href=\"mailto:' + nameVar + '@' + domainVar + '\">');
    document.write(nameVar + '@' + domainVar + '</a>'); 
}

// wis inputvelden default text
function clearDefault(el) {
  if (el.defaultValue==el.value) el.value = ""
}

function randomBackground(idName,amount,prefix,position,repeat){
var randomNumber = 1+Math.floor(Math.random()*amount);
var myElement = document.getElementById(idName);
myElement.style.backgroundImage = "url("+prefix+randomNumber+".jpg)";

//dit wil je misschien veranderen per project:
myElement.style.backgroundPosition = position;
myElement.style.backgroundRepeat = repeat;
}