Javascript : Save webpage. How to achieve?

I need "Save webpage" functionality. I tried it with the following code -

1 var active = '<OBJECT ID="active1" WIDTH=0 HEIGHT=0 CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>';

2 document.body.insertAdjacentHTML("beforeEnd", active);

3 active1.ExecWB(4,1);

4 active1.outerHTML ="";

This gives me an error : Object does not support property or method - Line 2

Any solution ? Thanks in advance.