//------------------------------- MENU SYSTEM ------------------------------------//	
menuTimer=0;

function setTimer() {
	menuTimer=setTimeout("hideAll()",1000);
}

function clrTimer() {
	clearTimeout(menuTimer);
}

function hideAll() { 
	hideLayer('dd1','dd2','dd3','dd4'); 
	clrTimer();
}
	
function showLayer() {
	hideAll();
	var n=showLayer.arguments.length; 
	for (var i=0; i<n; i++) { 
		var lyr = document.getElementById(showLayer.arguments[i]).style;
		if(lyr) { 
			lyr.visibility="visible";
		} 
	} 
} 


function hideLayer() { 
	var n=hideLayer.arguments.length; 
	for (var i=0; i<n; i++) { 
		var lyr = document.getElementById(hideLayer.arguments[i]).style; 
		if(lyr) { 
			lyr.visibility = "hidden";
		} 
	} 
}