function LoadWindow(url,window_name,w,h,opt){

		if(!window_name)
			var window_name = '_window_blank';

		if(!w) {
			w = 600;
			h = 500;
		}
		var leftPos = (screen.width - w)/2 -10;
		var topPos = (screen.height - h)/2 -20;

		var opt1 = opt ? opt : 'alwaysRaised=yes, toolbar=0, menubar=0, scrollbars=1,resizable=1';


		win = window.open(url, window_name,  'width=' + w + ',height=' + h + ',left=' + leftPos + ', top=' + topPos + ', '+opt1);
		
		win.focus();
}