function changeDisplay(arg)
{
	index = parseInt(arg);
	document.getElementById("protable1").style.display="none";	
	document.getElementById("protable2").style.display="none";	
	document.getElementById("protable3").style.display="none";	
	document.getElementById("protable4").style.display="none";	
	document.getElementById("protable"+index).style.display="";		
	
	document.getElementById("protd1").background="images/ieue.jpg";
	document.getElementById("protd2").background="images/ieue.jpg";
	document.getElementById("protd3").background="images/ieue.jpg";
	document.getElementById("protd4").background="images/ieue.jpg";
	document.getElementById("protd"+index).background="images/so8.jpg";

	document.getElementById("class_protd1").className="";
	document.getElementById("class_protd2").className="";
	document.getElementById("class_protd3").className="";
	document.getElementById("class_protd4").className="";
	document.getElementById("class_protd"+index).className="green4";
	
}