.colmask {
   position:relative;	 /* This fixes the IE7 overflow hidden bug and stops the layout jumping out of place */
   clear:both;
   float:left;
   width:100%;		/* width of whole page */
   overflow:hidden;	/* This chops off any overhanging divs */
   padding:20px 0;
   padding:20px 0px;
}
/* 2 column right menu settings */
.rightmenu {
   background:green;
   background:none;
}
.rightmenu .colleft {
   float:left;
   width:200%;
   margin-left:-290px;
   margin-left:-310px;
   position:relative;
   right:100%;
   background:red;
   background:none;
}
.rightmenu .col1wrap {
   float:left;
   width:50%;
   position:relative;
   left:50%;
   padding-bottom:0;
}
.rightmenu .col1 {
   margin:0 40px 0 290px;
   margin:0 20px 0 310px;
   overflow:hidden;
   background: yellow;
   background:none;
   min-height:400px;
}
.rightmenu .col2 {
   float:right;
   width:280px;
   width:300px;
   position:relative;
   left:290px;
   left:310px;
   padding-top:10px;
   background: blue;
   background:none;
}