function winopen(url,a,b){
	newwin=window.open(url,a,b)
}

var winPop = null;

function openPopup(url,a,b)
{

	if(winPop != null && !winPop.closed){
		winPop.focus();
	}
	else
	{
		winPop = window.open(url, a, b);
		winPop.focus();
	};
	
	return false;
}