var Zoom = new Zoom_System();

function Zoom_System(){
Zoom_System.prototype.findobj = function(obj){
this.parent = window.document;
if(this.parent.getElementById && this.parent.getElementById(obj)){return this.parent.getElementById(obj);}
return null;
}
Zoom_System.prototype.fontsize = function(obj,gui){
var fontcont = this.findobj(obj);
  if(gui<0){ var fsize=-1; } else { var fsize=1; }
   var resize = parseInt(fontcont.style.fontSize) + fsize;
 if(resize >= 8 && resize < 30){
  fontcont.style.fontSize = resize + 'px';

 }
 return false;
}
}