update_hidden=function(nm) {
	//alert(nm);
var dex=document.getElementById("my_yy"+nm).selectedIndex;
var YY=document.getElementById("my_yy"+nm).options[dex].value;
var dex=document.getElementById("my_mm"+nm).selectedIndex;
var MM=document.getElementById("my_mm"+nm).options[dex].value;
var dex=document.getElementById("my_dd"+nm).selectedIndex;
var DD=document.getElementById("my_dd"+nm).options[dex].value;
document.getElementById(nm).value=YY+"-"+MM+"-"+DD;
//alert (YY+"-"+MM+"-"+DD);
}