function RandomizeGenercImage()
{
    var randomnumber = Math.round((Math.random()*10));
    var imageArray = new Array();
    imageArray[0] = "/SiteResources/images/a_masthead1.jpg";
    imageArray[1] = "/SiteResources/images/a_masthead2.jpg";
    imageArray[2] = "/SiteResources/images/a_masthead3.jpg";
    imageArray[3] = "/SiteResources/images/a_masthead4.jpg";
    imageArray[4] = "/SiteResources/images/a_masthead5.jpg";
    imageArray[5] = "/SiteResources/images/e_masthead1.jpg";
    imageArray[6] = "/SiteResources/images/e_masthead2.jpg";
    imageArray[7] = "/SiteResources/images/e_masthead3.jpg";
    imageArray[8] = "/SiteResources/images/e_masthead4.jpg";
    imageArray[9] = "/SiteResources/images/e_masthead5.jpg";
    imageArray[10] = "/SiteResources/images/e_masthead6.jpg";

    if(document.getElementById("HeaderImage")){
        document.getElementById("HeaderImage").src = imageArray[randomnumber];
    }    
}

//document.body.onload = RandomizeGenercImage
addLoadEvent(RandomizeGenercImage);