// JavaScript Document
function showadv(par)
{
	document.getElementById("a1").style.display = "none";
	document.getElementById("a2").style.display = "none";
	document.getElementById("a3").style.display = "none";
	document.getElementById("a4").style.display = "none";
	document.getElementById(par).style.display = "";
}
	function chang(name){
	//
		var jpg='images/'+name+'_d.jpg';
		document.getElementById('img').src=jpg;
	}