function openPopup(_url,_winName,_width,_height,_scroll,_return) {
	var _y = (screen.height - _height) / 2;
	var _x = (screen.width - _width) / 2;
    var x = window.open(_url,_winName,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+_scroll+',resizable=no,copyhistory=no,top='+_y+',left='+_x+',screenY='+_y+',screenX='+_x+',width='+_width+',height='+_height);
	x.focus();
	if (_return)
	    return x;
}

function clickButton(e, buttonid) {

	var bt = document.getElementById(buttonid); 
	
	if(bt.tagName == "A") {
		if (e.keyCode == 13) {
			location.href = bt.href;
			return false;
		}
	}
	else {
		if (typeof bt == 'object') {
			if (e.keyCode == 13) {
				bt.click(); 
				return false; 
			}
		}
	}
}