var p1, p2, p3, p4;

if(document.images)
{
		p1 =  new Image();
		p2 =  new Image();
		p3 =  new Image();
		p4 =  new Image();


		p1.src= "text.css/navigation_bg";
		p2.src= "text.css/navigation_bg";
		p3.src= "text.css/navigation_bg";
		p4.src= "text.css/navigation_bg";
		
}