function roll(img_name, img_src){
    document[img_name].src = img_src;
}

function email(){
    var username = "enquiries";
    var hostname = "isis-forensics";
    var extname = ".com";
    document.write("<a href=" + "mail" + "to:" + username +
        "@" + hostname + extname + "?subject=EnquiryFromWebsite>" + username + "@" + hostname + extname + "</a>");
}

function email2(){
    var username = "child-defence";
    var hostname = "isis-forensics";
    var extname = ".com";
    document.write("<a href=" + "mail" + "to:" + username +
        "@" + hostname + extname + "?subject=EnquiryAboutChildDefence>" + username + "@" + hostname + extname + "</a>");
}

function clearText(field){

    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;
}