var windowWidth;
var windowHeight;

function checkWidth()
{
    if (document.body.offsetWidth)  windowWidth  = document.body.offsetWidth;
    if (window.innerWidth)          windowWidth  = window.innerWidth;
    if (document.body.offsetHeight) windowHeight = document.body.offsetHeight;
    if (window.innerHeight)         windowHeight = window.innerHeight; 

    //alert( windowWidth );

    setStylesheet( windowWidth );
}

function setStylesheet( windowWidth )
{
    if( windowWidth <= 1100 )
    {
        document.getElementById( "ctl00_widthStyle" ).href =  "/CustomerData/1/Styles/1024.css";
    }
}