Use JS variable to set the src attribute for <script> tag

I want to use a javascript variable as a 'src' attribute for another tag on the same jsp.

<script>
var link = mylink // the link is generated based on some code
</script>

I want to create this new element as shown below.

<script src="mylink">
</script>

On searching various forums, I have tried using the following options but they don't seem to work. I want this thing to work on all major browsers.

1. Put this code in the first element.

   var script   = document.createElement("script");
   script.type  = "text/javascript";
   script.src   = "path/to/somelink";
   document.body.appendChild(script);
   

2. Use document write method in the first element.

   document.write("<script type='text/javascript' src="+ google.com + "><\/script>");
   

3. Tried to set a JSTL Variable in the first element and use it.

   <c:set var="URL" value="mylink"/>
   

None of these ways were successful. Any suggestions on what is going wrong?