The ImageLink macro accepts the name of an image from the collateral folder, and creates the image (with all of it's associated properties)
as a link to itself by default, but can link anywhere you'd like it to.

Usage:  ^ImageLink(name[,popup,url]);

name  - Name of collateral item you wish to create an ImageLink for (required)
popup - Set this to 1 if you'd like to link to pop up in a new window.  This is 0 by default. (optional)
url   - URL to go to when image is clicked.  This defaults to a link to the full image (optional).

******Examples********

### Create an image which links to itself
^ImageLink("collateralItem");

### Create an image which links to itself, but pops up in a new window
^ImageLink("collateralItem",1);

### Create an image which links to yahoo and pops up in a new window
^ImageLink("yahooImage",1,"http://www.yahoo.com");

### Create an image which links to my homepage
^ImageLink("logo",0,^/;);