function showSubmenu(oMenu, sSubmenu){
	hideSubmenus();
	var coors = findPos(oMenu);
	coors[0] -= 60;
	coors[1] -= 120;
	$("#"+sSubmenu).css("left", coors[0]);
	$("#"+sSubmenu).css("top", coors[1]);
	$("#"+sSubmenu).css("display", "block");		
	$("#"+sSubmenu).css("position", "absolute");		
}

function hideSubmenus(){
	$('#submenu1').css("display", "none");	
	$('#submenu2').css("display", "none");	
	$('#submenu3').css("display", "none");	
	$('#submenu4').css("display", "none");	
	$('#submenu5').css("display", "none");	
}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

function imagePreloader(){
	
    if (document.images)
    {     	
      	// set image url
      	var image_url = new Array();
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_contact_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_database_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_home_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_council_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_ethics_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/menu_info_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/submenu_hover.jpg";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/optionsCH_hover_01.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/optionsCH_hover_02.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/optionsCH_hover_03.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/optionsCH_hover_04.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/20071206optionsCH_hover_01.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/20071206optionsCH_hover_02.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/20071206optionsCH_hover_03.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/20071206optionsCH_hover_04.gif.png";
	image_url[image_url.length] = "http://cdn.presscouncil.org.hk/img/20071206optionsCH_hover_05.gif.png";


	var preload_image_object = new Array();
	for(var i=0; i<image_url.length; i++) 
	{
		preload_image_object[i] = new Image();
		preload_image_object[i].src = image_url[i];
	}
    }
}

function init(){
	imagePreloader();
}