var browser = navigator.appName
var ver = navigator.appVersion
var thestart = parseFloat(ver.indexOf("MSIE")) + 1 //This finds the start of the MS version string.
var brow_ver = parseFloat(ver.substring(thestart + 4, thestart + 7)) //This cuts out the bit of string we need.

if ((browser == "Microsoft Internet Explorer") && (brow_ver < 6)) //By default the min. IE ver is set to 6. Change as desired.
{
    window.location = "http://www.computerhelpsos.com/Company/Indexie55/"; //URL to redirect to.
}