function MM_showHideLayers(obj, left, top, offsetLeftValue, offsetTopValue) {
	if (document.getElementById(obj).style.visibility == 'hidden') {
		document.getElementById(obj).style.left = left+offsetLeftValue;
		document.getElementById(obj).style.top = top+offsetTopValue;
		document.getElementById(obj).style.visibility = "visible";			
	} else {		
		document.getElementById(obj).style.visibility = "hidden";			
	}
}

function showHideMenu(id) {
	var msg="";
	if ((document.getElementById('menuSession'+id).style.display == 'block') || (document.getElementById('menuSession'+id).style.display == '')) {
		document.getElementById('menuSession'+id).style.display = 'none';
		document.getElementById('icoSession'+id).src = "img/bullet_toggle_plus.gif";
	} else {
		document.getElementById('menuSession'+id).style.display = 'block';
		document.getElementById('icoSession'+id).src = "img/bullet_toggle_minus.gif";
	}
}

function getX(imagename){
	theImg= document.getElementById(imagename);
	return getOffsetLeft(theImg);
}

function getY(imagename){
	theImg= document.getElementById(imagename);
	return getOffsetTop(theImg);
}

function getOffsetTop (el) {
	var ol = el.offsetTop;
	while ((el = el.offsetParent) != null)
	  ol += el.offsetTop;
	return ol;
}

function getOffsetLeft (el) {
	var ol = el.offsetLeft;
	while ((el = el.offsetParent) != null)
	  ol += el.offsetLeft;
	return ol;
}

function showHideItem(id) {
	el = document.getElementById(id);
	var display = el.style.display ? '' : 'none';
	el.style.display = display;
} // showHideItem