Set the value of 'link' parameter from a javascript function

It is possible, to set the value of 'link' parameter from a javascript function?
Ex:
<script>
function fct(){
window.location = "http:// ....."
}
</script>

......

<title> Title </title>
<description> Description </description>
<link onclick='fct()'> &nbsp; </link>

 

I'm guessing you mean a hyperlink (<a>) and not the link tag (<link>). As link tags should never even be visible, let alone clickable.
You can change any attribute of a tag using setAttribute() - lookup unobtrusive javascript.