function GetScreenDpi() 
{
    if (screen && screen.deviceXDPI)
    {
    var headID = document.getElementsByTagName("head")[0];         
    var cssNode = document.createElement('link');
    cssNode.type = 'text/css';
    cssNode.rel = 'stylesheet';
    cssNode.media = 'screen';

    if (screen.deviceXDPI <= '96') 
    {
       cssNode.href = '/css/style.ie.css';
    }
    else
    {
        cssNode.href = '/css/style.ie.dpi.css';
    }

    headID.appendChild(cssNode);

    }

}

GetScreenDpi();