Heya, Im a Javascript n00b, just curious as to why this script doesn't work , i know it's basic...

This is the function in the head section of a HTML file...
VB Code:
  1. <script language="JavaScript">

  2. <!--

  3.     Function callpic(picname)

  4.     { var h = 480;

  5.     var w = 640; 

  6.     var l = (screen.width - w) / 2;

  7.     var t = (screen.height - h) / 2;

  8.     var fullpicname="http://users.bigpond.net.au/maniac/images/"+picname;

  9.     window.open('fullpicname', 'blank', 'width='+w+', height='+h+', top='+t+', left='+l); 

  10.     }

  11. //-->

  12. </script>

And this is a link which I want to call the function ...
VB Code:
  1. <a href="http://***.***.net.au/***.htm" onClick="callpic('game-nfs1.jpg');">Image 1</a>

any thoughts, opinions or ***'s appreciated