Add pop-up for Sign in Vtiger 6.1

Add a button (or set a field), to open a pop-up when this is clicked In pop-up we can see a window as this: [login to view URL] (this plugin is for example but if you know other opensource solution is the same) with this plugin we can wrote in two display Area: Signature Technical: Signature Customer: At the end of this operation (technical and custumer are sign two related area) click button to return on vtiger; and in this moments two image generate from plugin have to put in ticket, (there are already two field image to save this two image provide to plugin)