#maincontent {
	
	margin-left: auto;
	margin-right: auto;
}
	
.grid  {
	width: 700px;
	margin-left: auto;
	margin-right:auto;
}
.grid .col {
	float: left;
	margin: 0px 0px 0px 0px;
}
.grid .x1  { width: 140px; }
.grid .x2  { width: 280px; }
.grid .x3  { width: 420px; }
.grid .x4  { width: 560px; }
.grid .x5  { width: 700px; }