error someone help please

im trrying to get this random image with link to work
but i get this error "untermenated string constant"

<script language="javascript">
<!--

var b1dis = "<a href=http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/\"";
var bdis = "\"><img src=http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/http://www.codingforums.com/archive/index.php/\"";
var edis = " width=\"100\" height=\"100\" alt=\"some text\" border=\"0\"></a>";
var rnumb = "";
var img = "";

rnumb += Math.floor(Math.random()*3);
img = rnumb;
if (img == "0") {
document.write(b1dis+ "page1.html" +bdis+ "/1.gif"" +edis);
}
if (img == "1") {
document.write(b1dis+ "page2.html" +bdis+ "/1.gif"" +edis);
}
if (img == "2") {
document.write(b1dis+ "page3.html" +bdis+ "/1.gif"" +edis);
}
// -->
</script>