function ChangeBg() { 
	if (!is_msie()) 
		return; 

	var  bg;	
	for(i=0; i<20; i++){
		cEval = "bg=document.getElementById('bg"+i+"')";
		eval(cEval);
		if(undefined != bg)
			bg.background="none";
	}
}

function is_msie() { 
	return navigator.userAgent.toLowerCase().indexOf("msie") != -1; 
}