// JavaScript Document
		function ShowDiv(obj) {
	document.getElementById("b1").className="menuOn";
	document.getElementById("b2").className="menuOn";
	document.getElementById("b3").className="menuOn";
	for(var i=1; i<=3; i++) {									
		document.getElementById("M_" + i.toString()).style.display = "none";
	}
	document.getElementById("M_" + obj).style.display = "block";
	if(obj=="1")
		document.getElementById("b1").className="menuOver";
	else if(obj=="2")
		document.getElementById("b2").className="menuOver";
	else
		document.getElementById("b3").className="menuOver";
}