function rand_img()
{
 var imgs = new Array(
        "img/1.jpg,214",
        "img/2.jpg,214",
        "img/3.jpg,214",
		"img/4.jpg,214",
		"img/5.jpg,214",
		"img/6.jpg,214",
		"img/7.jpg,214",
		"img/8.jpg,214",
		"img/9.jpg,214",
		"img/10.jpg,214",
		"img/11.jpg,214",
		"img/12.jpg,214",
        "img/13.jpg,214");
 var n      = Math.floor(Math.random() * imgs.length);
 var data   = imgs[n];
 var comma0 = data.indexOf(",");
 var data0  = data.substring(0, comma0);
 var data1  = data.substring(comma0 + 1);
 var src    = data0;
 var width  = 780;              // Constant
 var height = data1;              // Constant
 var img    = '<' + 'IMG SRC="' + src +
 '" WIDTH="' + width + '" HEIGHT="' + height +
 '" BORDER="0"><br>';'<' + 'IMG SRC="' + src +
 '" WIDTH="' + width + '" HEIGHT="' + height +
 '" BORDER="0">';
 document.write(img);
}