if(document.images)
 {
 	image1 = new Image(160,38);
	image1.src = "images/menubutton.png";
	
 	image1 = new Image(160,38);
	image1.src = "images/menuonclick.png";

	}
	
if ((screen.width>=800) && (screen.height>=600))
{
	document.write('<link href="desktop.css" rel="stylesheet" type="text/css">');
}
else
{
	document.write('<link href="iphone.css" rel="stylesheet" type="text/css">');
}

function button(obj, img)
{
 				 var el =document.getElementById(obj);
 				 el.style.backgroundImage =img;
				 

}