// JavaScript Document
function expandIt(whichElement) {
		whichEl = document.getElementById(whichElement);
		whichEl.style.display=(whichEl.style.display=="block" ) ? "none" : "block";
}

function clearField(field2clear) {
	field2clear.value = "";
}

function enableComboMaterias(chkVal) {
		document.getElementById('cbMaterias').disabled=!chkVal;
		document.getElementById('cbMaterias').selectedIndex=0;
}