function toggleMenu(objID, objMenu) {
if (!document.getElementById) return;
var ob = document.getElementById(objID).style;
ob.display = (ob.display == 'block')?'none': 'block';
var myImages = objMenu.getElementsByTagName("img")
for(var i="0"; i<myImages.length; i++){
	if ( ob.display=="block" ) {
		myImages[i].src = myImages[i].src.replace("plus","minus");
	} else {
		myImages[i].src = myImages[i].src.replace("minus","plus");
	}
}
}