var site_width = 990;
var screen_width = GetWidth();

var new_margin = (screen_width - site_width) / 2;

if(new_margin >= 0)
{
	var style = "position:relative; margin-left:"+new_margin+"px;";
	document.write("<style type=\"text/css\"> body {"+style+"}</style>");
	
	//var style = "position:relative; margin-left:"+new_margin+"px; background:#fff; width:"+site_width+"px;";
	//document.write("<style type=\"text/css\"> #wrap {"+style+"} body {background:#ddd;}</style>");
}

function GetWidth()
{
	var x = 0;
	if (self.innerWidth)
	{
		x = self.innerWidth;
	}
	else if (document.documentElement && document.documentElement.clientWidth)
	{
		x = document.documentElement.clientWidth;
	}
	else if (document.body)
	{
		x = document.body.clientWidth;
	}
	return x;
}