.index_left_mid{ float:left; width:725px;}
.top2_left{ float:left; width:272px;}
.main_left{ float:left; width:282px;}
.top2_mid,.main_mid{ float:right; width:437px;}
.top2_right{ float:right; width:272px;}
.main_right{ float:right; width:714px;}
.clear{clear:both;}