var pics;
var objCount=0;

pics = new Array();

function preload(name, picname1, picname2)
{   
    pics[objCount] = new Array(2);
    pics[objCount][0] = name;
    pics[objCount][1] = new Image(); pics[objCount][1].src = picname1;
    pics[objCount][2] = new Image(); pics[objCount][2].src = picname2;
    objCount++;
}

function On(name, shadow)
{
	for(i=0; i<objCount; i++) 
	{
	   	if(name==pics[i][0]) 
		{
			obj = document.getElementById('bg'+name);
		 	document.images[pics[i][0]].src = pics[i][2].src;
			if (shadow == 0) obj.className = "on";
			else obj.className = "onwsh";
		} 
	}
}

function Off(name, shadow)
{
	for(i=0; i<objCount; i++) 
	{
	   	if(name==pics[i][0]) 
		{
			obj = document.getElementById('bg'+name);
		 	document.images[pics[i][0]].src = pics[i][1].src;
			if (shadow == 0) obj.className = "off";
			else obj.className = "offwsh";
		} 
   	}
}

preload("menu1","/imgs/menu_p1.jpg","/imgs/menu_p1_s.jpg");
preload("menu2","/imgs/menu_p2.jpg","/imgs/menu_p2_s.jpg");
preload("menu3","/imgs/menu_p3.jpg","/imgs/menu_p3_s.jpg");
preload("menu4","/imgs/menu_p4.jpg","/imgs/menu_p4_s.jpg");