Image Swapping

[shashipkiran]

I want to swap two images back and forth based on a mouse click. eg + and -.
i am doing this on a tree structure based on the values extracted from the database.
eg

+ English
- Maths
- Trignometry
+ Chemistry

and the code which i am using is

<script language='javascript' type='text/javascript'>
intImage = 2;
function swapimage() {
switch (intImage) {
 case 1:
   imgname.src = "plus.gif"
   intImage = 2
   return(false);
case 2:
   imgname.src = "minus.gif"
   intImage = 1
   return(false);
 }
}
</script>

Now the problem is that i am only able to do this image swapping on 'English'. But i want this for the entire TREE Structure based on the node which the user clicks.

Please help.....