Como hacer compatible el float left con IE6

[gVenom]

Código HTML:

@charset "utf-8";
/* CSS Document */

.style1{ /*links izq*/
	font-family:"Myriad Pro", Rockwell, Lucida Sans;
	font-size:15px;
	color:#ffffff;
	font-weight:bold;
	}
	
.style2{  /*titulos*/
	font-family:"Apple Garamond", Bodoni MT , Lucida Sans;
	color:#a66c27;
	font-size:25px;
	font-weight:bold;
	margin-top:auto;
	margin-right:25px;
	text-align:right;
}
.style3{ /*texto normal*/
	font-family:"Arial", Helvetica, sans-serif;
	font-size:12px;
	text-align:justify;
}
.style4{ /*texto bottom*/
	font-family:"Myriad Pro", Rockwell, Lucida Sans;
	font-size:11px;
	color:#ffffff;
}
.style5{ /*subtitulos morados*/
	font-family:"Apple Garamond", Centaur;
	font-size:18px;
	color:#934996;
	font-weight:bold;
}
.style6{/*subtitulos2*/
	font-family:"Apple Garamond", Centaur;
	font-size:16px;
	color:#990000;
	font-weight:bold;
}
	
.img_grande{margin:3px; float:left}
.img_grander{margin:3px; float:right}
.boxes{margin:0px 0px 1px 0px; float:left;}
.boxes2{margin:0px 0px 1px 0px; float:right;}

table, tr, td {
margin: 0;
padding: 0;
border-collapse: separate;
}

table {
margin: 0 auto;
}

#divarrow{
	margin:5px;
	margin-bottom:20px;
}
#scroll { 
	width:auto;
	height:100%; 
	overflow:auto; 
}

el boxes2 no estaba. Lo puse ahorita para probar.