I'm trying to add the ability to insert an image into the background of a div. I have my CSS:

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<style type="text/css">
   .mainBackground {
   background: #000 url('$BackgroundImage') no-repeat left top;
   }
   </style>
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And added the proper tab into the php page:

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$fields->addFieldToTab("Root.Content.Images", new ImageUploadField('BackgroundImage', 'Background Image'));
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Everything functions as expected EXCEPT, it adds in the '<img src' tag (as it should). Is there a way to have the same functionality, only JUST insert the actual image path WITHOUT the 'img src' tag or the 'alt' tag?

Thanks!