function onlyDigit(el) 
{
    el.value = el.value.replace(/\D/g,'');
}

function go_back() 
{
    history.go(-1);
}

function go_replace(url) 
{
    location.replace(url);
}

function ProtectDouble(tmp)
{
    document.getElementById(tmp).disabled = true;
    setTimeout("document.getElementById('"+tmp+"').disabled = false", 3000);
}

function go_linkwindow(link)
{  
    window.open(link);
}

function onlyEnglish(el) 
{
    onvalue = el.value;
    
    if ((onvalue.search(/[^a-z0-9]/) != -1) || (onvalue == "")) 
    {
        el.value = "";
        el.focus();
        return false;
    }
}