Mine

function createCustomConfirm(txt,title, func) {
        d = document;
        title = CONFIRM_TITLE;

        if (d.getElementById("modalContainer")) return;
        mObj = d.getElementsByTagName("body")[0].appendChild(d.createElement("div"));
        mObj.id = "modalContainer";
        mObj.style.height = d.documentElement.scrollHeight + "px";

        confirmObj = mObj.appendChild(d.createElement("div"));
        confirmObj.id = "alertBox";
        if(d.all && !window.opera) confirmObj.style.top = document.documentElement.scrollTop + "px";
        confirmObj.style.left = (d.documentElement.scrollWidth - confirmObj.offsetWidth)/2 + "px";
        confirmObj.style.visiblity="visible";
        self.focus();

        h1 = confirmObj.appendChild(d.createElement("h1"));
        h1.appendChild(d.createTextNode(CONFIRM_TITLE));

        msg = confirmObj.appendChild(d.createElement("p"));
        msg.appendChild(d.createTextNode(txt));

        btnYes = confirmObj.appendChild(d.createElement("a"));
        btnYes.id = "closeBtn";
        btnYes.appendChild(d.createTextNode(CONFIRM_BUTTON_YES));
        btnYes.href = "#";
        //btnYes.focus();
        btnYes.onclick = function() {
        removeCustomConfirm();
                try{
                        eval(func);
                }catch(err){}
                 return false; }

        btnNo = confirmObj.appendChild(d.createElement("a"));
        btnNo.id = "closeBtn";
        btnNo.appendChild(d.createTextNode(CONFIRM_BUTTON_NO));
        btnNo.href = "#";
        //btnNo.focus();
        btnNo.onclick = function() { removeCustomConfirm(); delayer(); return false; }
        alertObj.style.display = "block";
}