function noBackspace(e){
    var keynum;
    
    if (window.event) // IE
    {
        keynum = e.keyCode;
        if (keynum == 8 && e.srcElement.nodeName == "BODY") 
            return false;
    }
    else 
        if (e.which) // Netscape/Firefox/Opera
        {
            keynum = e.which;
            if (keynum == 8 && e.target.nodeName == "HTML") 
                return false;
        }
    return true;
}

function mainDivHeight(){
    return (pageWidth - 80)
}

function submitForm(formName){
    if (formName == null) {
        document.forms[0].submit()
    } else {
        document.supportform.submit()
    }
}

// Browser Window Size and Position
// copyright Stephen Chapman, 3rd Jan 2005, 8th Dec 2005
function pageWidth(){
    return window.innerWidth != null ? window.innerWidth : document.documentElement && document.documentElement.clientWidth ? document.documentElement.clientWidth : document.body != null ? document.body.clientWidth : null;
}

function pageHeight(){
    return window.innerHeight != null ? window.innerHeight : document.documentElement && document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body != null ? document.body.clientHeight : null;
}

function posLeft(){
    return typeof window.pageXOffset != 'undefined' ? window.pageXOffset : document.documentElement && document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft ? document.body.scrollLeft : 0;
}

function posTop(){
    return typeof window.pageYOffset != 'undefined' ? window.pageYOffset : document.documentElement && document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop ? document.body.scrollTop : 0;
}

function posRight(){
    return posLeft() + pageWidth();
}

function posBottom(){
    return posTop() + pageHeight();
}