function clearText(thefield){
if (thefield.defaultValue==thefield.value)
thefield.value = ""
}

function change_image(id, image){
document.getElementById(id).src=image;
}

function change_bordercolor(id, color){
document.getElementById(id).style.borderBottom="solid 2px " + color;
}

function clear_checkbox(){
	for (i=0;i<document.kleurenform.elements.length;i++){
			if (document.kleurenform.elements[i].type == 'checkbox'){
			document.kleurenform.elements[i].checked = false;
			}
	}
}

function ChangeText(id, text)
{
   var MyElement = document.getElementById(id);
   MyElement.value = text;
   return true;
}

function ChangeOrderAmount(input_value, multi, result_div)
{
   var result=Math.round(input_value)*multi;
   var MyElement = document.getElementById(result_div);
   MyElement.value = result;
   return true;
}