//CENTER SCRIPT
var elementWidth = 800;
var elementHeight = 600;
function center()
{
	var width = document.getElementById("bodyc").offsetWidth;
	var height = document.getElementById("bodyc").offsetHeight;
	
	if(elementWidth >= width){
		var x = 0;
	}else{
		var x = (width / 2) - (elementWidth / 2);
	}
	
	if(elementHeight >= height){
		var y = 0;
	}else{
		var y = (height / 2) - (elementHeight / 2);
	}
	
	document.getElementById("principal").style.top = Math.round(y)+"px";
	document.getElementById("principal").style.left = Math.round(x)+"px";
	
	setTimeout("center()",500);
}