Вот стили, для блоков.
#mega_hbanner,
#mega_hextend1,
#mega_hextend2,
#mega_hmainbody,
#mega_hfooter{
position: absolute;
left: 0;
.mega_wrapper_i,
.mega_banner,
.mega_extend1,
.mega_extend2,
.mega_tops_extend,
.mega_mainbody,
.mega_footer{
width: 100%;
float: left;
}