Adding disable "window.open" to open new form in new tab. How to resolve this contradiction?

I was using the window.open( ) in order to open form in a new tab. Then when I added the <asp:updatepanel> <contenttempltae>, the below script stop working.
How can I resolve this contradiction problem?
Response.Write("<script>") Response.Write("window.open('NewPostTargets.aspx','_blank')") Response.Write("</script>") Thanks,