if (screen.height>=1000 )
	{
	document.write('<link rel="stylesheet" type="text/css" href="style3.css">');
	}
else if (screen.height>800)  {
	document.write('<link rel="stylesheet" type="text/css" href="style1.css">');
	}
else if (screen.height<=800)  {
	document.write('<link rel="stylesheet" type="text/css" href="style.css">');
	}
else {
	document.write('<link rel="stylesheet" type="text/css" href="style.css">');
	}