problem with the shop gui

[Rave_J]

http://i60.photobucket.com/albums/h2..._shop-menu.png

ok thats the gui
now im stuck on the part that is the mouse part
something like this

PHP Code:

if (leftmousebutton) {
      if (mousescreenx in |this.xloc+92,this.xloc+92+49| && mousescreeny in |this.yloc+123,this.yloc+123+21|) {
        this.on = 0;
        destory();
      } 


now how i find out what the numbers are where when u click it destory the gui ?