centering a div layout (firefox vs. internet explorer), centering a div layout (firefox vs. internet explorer) Options

[sensime3na]

Okay I'm having trouble centering a profile layout I'm doing on myspace. This is the cod I have currently on one of my divs:

CODE

.box1 {background-color:000000;
background-image:url('http://i191.photobucket.com/albums/z30/shamrockmartialarts/themmastars.jpg');
background-repeat: no-repeat;

width: 750px;
height: 217px;
z-index:5;
top:130;
left:50px;
position:absolute;
visibility:visible !important;
overflow:hidden; border:0px solid white}

It doesn't really center it in the page, but when I follow something I found on Createblog.com, like this:

CODE

.box1 {background-color:000000;
background-image:url('http://i191.photobucket.com/albums/z30/shamrockmartialarts/themmastars.jpg');
background-repeat: no-repeat;

width: 750px;
height: 217px;
z-index:5;
top:130;
left:-375px;
margin-left: 50%;
position:absolute;
visibility:visible !important;
overflow:hidden; border:0px solid white}

It will center it perfectly in Firefox / Netscape, but when I try to view the page in Internet explorer it makes my image jump way far too the left, and doesn't center it.

Is this just one of those glitches with the differences between firefox and internet explorer? Or am I just coding it wrong?

I searched all through the scripts and tutorials, as well as all over the web--- can anyone help?

It would be wonderful....

Thanks,
Gemm