objPrevDropMenu = null;

function imgOn(element, layerNum){
	hideMenu(objPrevDropMenu);
	element.style.cursor = "pointer";
	element.style.backgroundColor = "#EEEEEE"
}

function imgOff(element, layerNum){
	element.style.backgroundColor = "#FFFFFF"
}

function showMenu(element){
	if(element.id.indexOf('DropMenu') == -1){
		if(objPrevDropMenu)
			hideMenu(objPrevDropMenu);
		menuName = element.id + 'DropMenu';
		objDropMenu = document.getElementById(menuName);
		objDropMenu.style.visibility = 'visible'
		objPrevDropMenu = objDropMenu
	}else{
		element.style.visibility = 'visible';
		objPrevDropMenu = objDropMenu
	}
}

function hideMenu(element){
	if(element){
		if(element.id.indexOf('DropMenu')==-1){
			menuName = element.id + 'DropMenu';
			objDropMenu = document.getElementById(menuName);
			objDropMenu.style.visibility = 'hidden'
		}else{
			element.style.visibility = 'hidden';
		}
	}
}