IE vs FF, yell at me i dont care Options

[starlette]

Okay so I'm not oging thru all 600 pages to find if someone else asked this. bare with me. so okay, I'm working on a xanga skin (link) and it looks great in ie but off in ff. then if I set it correct for ff its off in ie. the annoying thing is the only difference is whether its negative or positive see here :

CODE

<div style="position:absolute;
margin-left: 300px;
margin-top: -445px;
border: 0px;
width: 244px;
height: 115px;
background: none;
overflow: auto">

for the top section aaaand

CODE

<div align="center" class="blogspace">

<div style="
overflow: auto;
width: 425px;
height: 210px;
margin-top: 70px;
margin-left: 285px;
position:absolute;">

which controls my blogspace. and literally I mean to fix it for ff all i have to do is change the margin-left from 285px to -285 px and same for the othe rone. Is there a way to fix this? I've tried changing the position from static to absolute and it made no difference. And I'm sure its misaligned in other resolutions too. How do i make it cross res and browser friendly?