function isNumberKey(evt) {
        var charCode = (evt.which) ? evt.which : event.keyCode
        if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
        return true;
    }
    function select_last_stelemax() {
        for (i=0; i<document.getElementById("stele_max").length; i++) { document.getElementById("stele_max").options[i].selected = true; }
    }
    function select_spec_stelemax(spec_value) {
        for (i=0; i<document.getElementById("stele_max").length; i++) {
            if (spec_value == document.getElementById("stele_max").options[i].value){ document.getElementById("stele_max").options[i].selected = true; }
        }
    }
    function isNumberKey(evt) {
        var charCode = (evt.which) ? evt.which : event.keyCode
        if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
        return true;
    }
    function popupcenter(pageURL, title,w,h) {
        var left = (screen.width/2)-(w/2);
        var top = (screen.height/2)-(h/2);
        var wfeatures = "toolbar=no, location=no, status=no, menubar=no, scrollbars=no, width="+w+", height="+h+", top="+top+", left="+left+", resizable=no";
        var w = (window.open(pageURL, '', wfeatures));

    }