var texts = new Array()

texts[1] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=1'></script>"
texts[2] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=2'></script>"
texts[3] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=3'></script>"
texts[4] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=4'></script>"
texts[5] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=5'></script>"
texts[6] = "<script language='javascript' src='http://justpersian.net/webtools2/cdate/?type=6'></script>"


var ry = Math.floor(Math.random() * texts.length)
if (ry == 0) { ry = 6 }

document.write(texts[ry]);
<script type="text/javascript" language="javascript" src="http://www.webgozar.ir/c.aspx?Code=621769&amp;t=counter" ></script>