function openWnd(url,w,h){
	w=(w?w:850);
	h=(h?h:700);
	var wnd=window.open(url,"win","width="+w+",height="+h+",scrollbars=1,toolbar=0,menubar=0,history=0,resizable=1");
	wnd.window.focus();
	return false;
}
function EnsureNumeric(){
	var key = window.event.keyCode; 
	if (!((key >=48 && key <=57) || key == 44))
		window.event.returnValue = false;
}
function hide_show(blockname){
	document.getElementById(blockname).style.display = (document.getElementById(blockname).style.display=="none" ? "block" : "none")
}