function openWin(url, name, w, h) { 
	var l = (screen.width - w) / 2; 
  	var t = (screen.height - h) / 2;
 	var specs = 'width = ' + w + ', height = ' + h + ' ,top = ' + t + ' ,left = ' + l;
  	var win = window.open(url, name, specs);
  	win.focus();
}

function topOfPage() {
	window.scrollTo(0,0);
}

function goBack() {
	history.go(-1);
	refreshPage();
}

function refreshPage()
{
    window.location.reload(false);
}