JavaScript runtime error: Object doesn't support property or method 'split'

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Javascript

jQuery

IE11

Dear All,

I getting error "JavaScript runtime error: Object doesn't support property or method 'split'" in below code I am using IE11 when I used the google chrome I am not getting error but functionality not working. I am using visual studio 2010 for MVC razor.
Please help.

var flashVer = -1; 
if (navigator.plugins != null && navigator.plugins.length > 0) {
    if (navigator.plugins["Shockwave Flash 2.0"] || navigator.plugins["Shockwave Flash"]) {
        var swVer2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0" : "";
        var flashDescription = navigator.plugins["Shockwave Flash" + swVer2].description;
        var descArray = flashDescription.split(" "); 
		var tempArrayMajor = descArray[2].split(".");
        var versionMajor = tempArrayMajor[0]; 
		var versionMinor = tempArrayMajor[1];
        var versionRevision = descArray[3]; 
		if (versionRevision == "") 
		{ 
			versionRevision = descArray[4] 
		}
        if (versionRevision[0] == "d") 
		{ 
			versionRevision = versionRevision.substring(1) 
		}
        else 
		{
			if (versionRevision[0] == "r") 
			{
				ersionRevision = versionRevision.substring(1);
				if (versionRevision.indexOf("d") > 0) 
				{ 
					versionRevision = versionRevision.substring(0, versionRevision.indexOf("d")) 
				}
			}
		}
        var flashVer = versionMajor + "." + versionMinor + "." + versionRevision
    }
}
else {
    if ($.browser.msie) {
        var version; var axo; var e;
        try { 
			axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.7"); 
			version = axo.GetVariable("$version") 
		}
        catch (e) { } 
		flashVer = version.replace("WIN ", "").replace(",", ".")
    }
}
flashVer = flashVer.split(".")[0];