function toggle(targetId){
	if (document.getElementById){
	target = document.getElementById(targetId);
		if (target.style.display == "none"){
		target.style.display = "";
		} else {
			target.style.display = "none";
		}
	}
}

function changeClass(elem,className1,className2)
{
elem.className = (elem.className == className1)?className2:className1;
if (!document.getElementById) return null;
document.getElementById(elem).className = (document.getElementById(elem).className == className1)?className2:className1;
}

function clearDefault(el) {
	if (el.defaultValue==el.value) el.value = ""
}