/*------------------------------------------------------------------------------
General Script Descriptions
This script contains functions to increase or decrease the fontsize in
centerFrame.
------------------------------------------------------------------------------*/

//define public variables
var domCenterFrame = "centerFrame";
var unit = "%";
var fz_interval = 5;
var fz_default = 100;
var fz_current = fz_default;

//browser switch DOM
function browserswitch(getDiv){
  var okDom;
  if(document.all){
    okDom = document.all[getDiv];
  }else{
    okDom = document.getElementById(getDiv);
  }
  return okDom;
}

//function increase fontsize
function fzPlus(){
  var okDomCenterFrame = browserswitch(domCenterFrame);
  
  if(fz_current < 126){
    fz_current = fz_current + fz_interval;   
    okDomCenterFrame.style.fontSize = fz_current + unit;
  }
}

//function decrease fontsize
function fzMinus(){
  var okDomCenterFrame = browserswitch(domCenterFrame);
  
  if(fz_current > fz_default){
    fz_current = fz_current - fz_interval;    
    okDomCenterFrame.style.fontSize = fz_current + unit;
  }
}

//function set default
function fz0(){
  var okDomCenterFrame = browserswitch(domCenterFrame);
   
  fz_current = fz_default;  
  okDomCenterFrame.style.fontSize = fz_current + unit;
}