<div id="loading" style="display:none;>
    <table border=0 style="width: 30%"><tr><td><hr></td></tr><tr><td style="text-align: center;">
    <span style="color:#666; font-weight:bold"><br/><br/>Please wait , Thinking...</span></br></br><br/>
    <img src="../images/spinner.gif"></td></tr></table>
</div>

<button id="makemppdfnow" onclick="javascript:loadingWait();" style="float: left; height: 36px; background-image: url(images/makepdf btn.png); background-repeat: no-repeat; background-position: left;padding left: 39px; color:#666; font-weight:bold" type="submit" formaction="/mkmppdf.php">'.$makepdf.'</button>

function loadingWait() {
    if (document.getElementById('makemppdfnow').click) {
        document.getElementById('loading').style.visibility = 'visible';
    } else {
        document.getElementById('loading').style.visibility = 'hidden';
    }