function preloadimg()
{
	var imgnil=new Image();
	var imgindicator=new Image();
	imgnil.src="/images/nil.gif"; 
	imgindicator.src="/images/indicator.gif"; 
}

function switchit(p_what,p_switchto){
	
	var sobj;
	sobj=document.getElementById(p_what);
	sobj.src="/images/"+p_switchto+".gif";
	
}