function disableSelection(element) {
	element.onselectstart = function() {
		return false;
		};
	element.unselectable = "on";
	element.style.MozUserSelect = "none";
	element.style.cursor = "default";
	}

function disableAllTextSelection(){
		disableSelection(document.body);
	}
	
function showHideLevel1(target){
	if(document.getElementById(target).style.display=="none") {
		document.getElementById(target).style.display="block";
		document.getElementById('img_'+target).src="images/menu_level1_open.png";
		}
	else {
		document.getElementById(target).style.display="none";
		document.getElementById('img_'+target).src="images/menu_level1_closed.png";
		}
	}
	
function showHideLevel2(target){
	if(document.getElementById(target).style.display=="none") {
		document.getElementById(target).style.display="block";
		document.getElementById('img_'+target).src="images/menu_level2_open.png";
		}
	else {
		document.getElementById(target).style.display="none";
		document.getElementById('img_'+target).src="images/menu_level2_closed.png";
		}
	}