In Javascript Class, how to call the prototype method.（three method）

1、Using Javascript eval Method。
2、using a veriables save object "this" reference.
3、in innerHTML, we can using String to pass the prototype Method。

e.g.

<SCRIPT LANGUAGE="JavaScript">
<！--
function myClass（instanceName）
{
this.instanceName = instanceName;
this.instance = this;
return this;
};
myClass.prototype.toAlert=function（）
{
eval（this.instanceName）.callback（）; // the first method to call prototype function.
this.instance.callback（）; // the second method to call prototype function.

// the third method to call prototype function.
document.write（"<a href="javascript:void（0）;" onclick="" + this.instanceName + ".callback（）;">instance call prototype function.</a>"）
};
myClass.prototype.callback=function（）
{
alert（"blueDestiny, never-online"）;
};
var a = new myClass（"a"）;
a.toAlert（）;
//-->
</SCRIPT>