var win = null;	
function showimage(file,wys,szer)
{
	settings='directories=no, location=no, menubar=no, titlebar=no, scrollbars=no, width='+wys+', height='+szer+', status=no, toolbar=no, resizable=no, left=100, top=100';
	if(win == null || win.closed)
	{
		win = window.open("showimage.php?file="+file,"",settings);
	}
	else
	{
	  	win.close();
		win = window.open("showimage.php?file="+file,"",settings);
		win.focus();
	};
}