#maincontent {
	
	margin-left: auto;
	margin-right: auto;
}
	
.grid  {
	width: 800px;
	margin-left: auto;
	margin-right: auto;
}
.grid .col {
	float: left;
	margin: 0px 0px 0px 0px;
}
.grid .x1  { width: 160px; }
.grid .x2  { width: 320px; }
.grid .x3  { width: 480px; }
.grid .x4  { width: 640px; }
.grid .x5  { width: 800px; }