function showdiv() {
                document.getElementById('signup_display1').style.display = 'none';
                document.getElementById('login_display1').style.display = 'block';
                document.getElementById('signup').style.backgroundImage = 'url(images/bluebutton1.jpg)';
                document.getElementById('login').style.backgroundImage = 'url(images/whitebutton1.jpg)';
            }
            function hidediv() {
                document.getElementById('signup_display1').style.display = 'block';
                document.getElementById('login_display1').style.display = 'none';
                document.getElementById('signup').style.backgroundImage = 'url(images/whitebutton1.jpg)';
                document.getElementById('login').style.backgroundImage = 'url(images/bluebutton1.jpg)';
            }
            function showTab(y) {
                for (i = 1; i <= 4; i++) {
                    document.getElementById("tab" + i).style.display = 'none';
                    document.getElementById("tabmenu" + i).src = "images/tab_" + i + ".jpg";
                }
                document.getElementById("tab" + y).style.display = '';
                document.getElementById("tabmenu" + y).src = "images/tab_" + y + "_sel1.jpg";
            }
            function MM_swapImgRestore() { //v3.0
                var i, x, a = document.MM_sr; for (i = 0; a && i < a.length && (x = a[i]) && x.oSrc; i++) x.src = x.oSrc;
            }
            function MM_findObj(n, d) { //v4.01
                var p, i, x; if (!d) d = document; if ((p = n.indexOf("?")) > 0 && parent.frames.length) {
                    d = parent.frames[n.substring(p + 1)].document; n = n.substring(0, p);
                }
                if (!(x = d[n]) && d.all) x = d.all[n]; for (i = 0; !x && i < d.forms.length; i++) x = d.forms[i][n];
                for (i = 0; !x && d.layers && i < d.layers.length; i++) x = MM_findObj(n, d.layers[i].document);
                if (!x && d.getElementById) x = d.getElementById(n); return x;
            }
            function MM_swapImage() { //v3.0
                var i, j = 0, x, a = MM_swapImage.arguments; document.MM_sr = new Array; for (i = 0; i < (a.length - 2); i += 3)
                    if ((x = MM_findObj(a[i])) != null) { document.MM_sr[j++] = x; if (!x.oSrc) x.oSrc = x.src; x.src = a[i + 2]; }
            }