stretch background image Options

[JimiB]

On my home page, the background image in the left content section suited the original template by only going half way down the columb.
Now i need to stretch the bg image down the full left content columb. i have tried changing my css without success.

CODE

#left_content{width:42%;height:auto;margin:10px;float:left;padding:10px;background:url(images/left_content_bg.png) repeat-x top;background-position:0 -18px;}