Pop up a aspx page from a Sharepoint portal page hyperlink

I want to pop up an aspx page from the Sharepoint portal page.
I want to create a hyperlink, and then when the hyperlink is clicked I want to pop up the aspx page.

I know how to poup a page using code behind or javascript but not sure how I can do that from a SharePoint portal page

StringBuilder sb = new StringBuilder();
 sb.Append("window.open('somepage.aspx?','mywindow','width=900,height=600,resizable=1,top=50,left=50,scrollbars=1');");
 ScriptManager.RegisterClientScriptBlock(this.Page, this.Page.GetType(), this.ClientID, sb.ToString(), true);