var myWidth = 0;
if( typeof( window.innerWidth ) == 'number' )
{ 
	//Non-IE 
	myWidth = window.innerWidth;
}
else
{
	// IE 6+ (earlier not supported)
	myWidth = document.documentElement.clientWidth;
}

if (800 > myWidth)
{
  document.write('<style TYPE="text/css"> <!-- body { padding:5px 10px 5px 10px; } .main {min-width: 0px;} --> </style>');
}