//Function to change page from option list
function linkURL(URL) {
	
	if (URL.options[URL.selectedIndex].value != "") self.location.href = URL.options[URL.selectedIndex].value;	
	return true;
}

//Function to open pop up window
function winOpener(theURL, winName, scrollbars, resizable, width, height) {
	
	winFeatures = 'left=' + (screen.availWidth-10-width)/2 + ',top=' + (screen.availHeight-30-height)/2 + ',scrollbars=' + scrollbars + ',resizable=' + resizable + ',width=' + width + ',height=' + height + ',toolbar=0,location=0,status=1,menubar=0'
  	window.open(theURL, winName, winFeatures);
}

function log_out()
{
	if (navigator.appVersion.indexOf("MSIE")!=-1)
	{
		ht = document.getElementsByTagName("body");
		ht[0].style.filter = "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)";
		if (confirm('Bạn có chắc muốn đăng xuất không?'))
		{
			ht[0].style.filter = "";
			document.location="/forum/log_off_user.asp";		
		}
		else
		{
			ht[0].style.filter = "";		
		}
	}
	else
	{
		document.location="/forum/log_off_user.asp";			
	}
}