moving text while keeping background-image in CSS

Question

I have a 'main_menu' div which contains a background-image that is repeating on the y-axis. Above this div I have another div which is used for a header. The problem is that the header div has an image which is about 75px in height. I would like to start the text in main_div about 50 px higher from where main_div's background-image actually starts.

I was thinking of something like:

position:absolute; top:-50px;

This doesn't really work. The question is how do I move the text up, while keeping the background-image at the normal spot.

Thanks

{EDIT}

Here's the CSS

.menu_main
{
background-image:url('../menu_main.jpg');
background-repeat:repeat-y;
width:173px;
padding:5px;    

}
.menu_header
{
background-image:url('../menu_header.jpg');
text-align:center;
width:173px;
height:65px;
padding:5px;    
}

This is the html

<div class="menu_header">Some Header</div>
<div class="menu_main">
    <ul>
        <li>Educational Objective</li>
        <li>Projects</li>
        <li>Class Preparation</li>
        <li>Testimonials</li>
    </ul>
</div>  

So as you can see the header is pretty tall. So I'd like to start the text in the menu_main div about 50px higher up

Solution

Use a negative top margin.

.menu_main ul {margin-top:-50px;}