mousescreenx question

[PrinceOfKenshin]

Ok i am just making a simple thing where if the mouse goes over the npc it shows the name and this is what i got. I don't understand why you have two x's and two y's.

PHP Code:

function onActionServerside() {
  setstring this.item,"Onion Rings",food,james-onionrings.gif,"f""f""f",20,1;
  setstring this.itemtype,food;
  setstring this.guild,Burger Shack;
  this.price=8;
}
//#CLIENTSIDE
function onCreated (){
  setstring this.item,"Onion Rings",food,james-onionrings.gif,"f""f""f",20,1;
}
    if (mousescreenx in |47,10|){

      if (mousescreeny in |11,158|){

        showtext 220,mousescreenx+5,mousescreeny-10,Tempus Sans ITC,b,Inventory;

        changeimgvis 220,7;

        changeimgzoom 220,.5;

}


}