var pWindow = null;
function picWindow( width, height )
{
if( pWindow && !pWindow.closed )
{
pWindow.close();
}
sWidth = screen.width;
sHeight = screen.height;
var pWindow = window.open( 'quiz.php',"displayWindow",'width=' + width + ',height=' + height + ',resizable=0,scrollbars=0,menubar=0,left=' + ( sWidth/2 - width/2 ) + ',top=' + ( sHeight/2 - height/2) + '\'');
pWindow.focus();
}