var ul = document.getElementsByTagName("ul");
	var li = document.getElementsByTagName("li");
	var mnt = 5;

function subMenu() {	
	li["service"].onmouseover = function() {
		ul["sub_1"].style.display = "block";
		if(ul["sub_2"].style.display == "block") {
			ul["sub_2"].style.display = "none";
		}
	}
	
	li["service"].onmouseout = function() {
		setTimeout("out('sub_1')",mnt*1000);
	}
	
	li["price"].onmouseover = function() {
		ul["sub_2"].style.display = "block";
		if(ul["sub_1"].style.display == "block") {
			ul["sub_1"].style.display = "none";
		}
	}
	
	li["price"].onmouseout = function() {
		setTimeout("out('sub_2')",mnt*1000);
	}
}

function out(ID) {
	ul[ID].style.display = "none";
}