JQuery自写alert弹窗

var str = "<div id="zhezhao" style="display:none;   100%; height: 100%; position: fixed; top: 0px; left: 0px; z-index: 9999;">";
str += "<div id="tanchuang" style=" 300px; margin: auto; top:-500px; position: relative;  box-shadow: 0px 0px 10px black; border-radius: 5px; font-family: 微软雅黑;">";
str += "<div id="tc-title" style=" 100%; height: 40px; position: relative; text-indent: 15px; line-height: 40px; "></div>";
str += "<div id="tc-context" style=" 100%; height: 30px; position: relative; margin-top: 20px; text-align: center; line-height: 30px; font-size: 1.3em;"></div>";
str += "<div id="tc-btns" style=" 100%; height: 30px; position: relative; margin-top: 20px;">";
str += "<div id="tc-btn1" style=" 80px; height: 30px; position: relative; left: 110px;  text-align: center; line-height: 30px; color: white; font-size: 1.2em; border-radius: 5px;cursor:pointer;">确 定</div>";
str += "</div><div style=" 100%; height: 30px; position: relative;"></div></div></div>";
document.getElementsByTagName("body")[0].innerHTML += str;


function SelfAlert(t, c) {
    $("#tc-title").text(t);
    $("#tc-context").text(c);
    $("#zhezhao").css("display", "block");
    $("#tanchuang").animate({ top: "200px" }, 300).animate({ top: "150px" }, 100).animate({ top: "200px" }, 200);
}

$("#tc-btn1").live("click", function () {
    $("#tanchuang").animate({ top: "250px" }, 200).animate({ top: "-500px" }, 300, function () {
        $("#zhezhao").css("display", "none");
    });
});

$("#tc-btn1").live("mouseover", function () {
    $(this).animate({ backgroundColor: "#890606" }, 300);
});
$("#tc-btn1").live("mouseout", function () {
    $(this).animate({ backgroundColor: "red" }, 300);
});