#global {
	height: 640px; /* -> 1 */
	width: 950px;
	overflow: hidden; 
	margin-left: auto;
	margin-right: auto;
	background: black;
}
#head {
	height: 20px;
	width: 800px;
	background: grey;
}
#corp{
	height: 600px;
	width: 800px;
	background: black;
}
#foot{
	height: 20px;
	width: 800px;
	background: grey;
}
#left{
	float: left;
	height: 600px;
	width: 300px;
	background: green;
}
#right{
	float: right;
	height: 600px;
	width: 500px;
	background: red;
}
#L1{
	height: 100px;
	width: 300px;
	overflow: hidden;
	background: yellow;
}
#L2{
	height: 200px;
	width: 300px;
	overflow: hidden;
	background: pink;
}
#L3{
	height: 300px;
	width: 300px;
	overflow: hidden;
	background: green;
}
#R1{
	height: 400px;
	width: 500px;
	overflow: hidden;
	background: blue;
}
#R2{
	height: 200px;
	width: 500px;
	overflow: hidden;
	background: orange;
}