uaName = navigator.userAgent;
appName = navigator.appVersion;

var fontSizeUnit = "%";

var perOrder = 20;

var defaultSize = 100;

var minOrder = 80;

var maxOrder = 140;

var currentSize = defaultSize;


function fsc( CMD){

  if( CMD == "larger" ){
   if ( currentSize < maxOrder ){
      var newSize = Number(currentSize + perOrder);
    }
    else{
      var newSize = Number(currentSize);
    }
  }

  if( CMD == "smaller" ){
     if ( currentSize > minOrder ){
      var newSize = Number(currentSize - perOrder);
    }
    else{
      var newSize = Number(currentSize);
    }
  }

  if( CMD == "default"){
     var newSize = defaultSize;
  }

  if( CMD == "larger_jsp" ){
   if ( currentSize < maxOrder ){
      var newSize = Number(currentSize + perOrder);
    }
    else{
      var newSize = Number(currentSize);
    }
  }

  if( CMD == "smaller_jsp" ){
     if ( currentSize > minOrder ){
      var newSize = Number(currentSize - perOrder);
    }
    else{
      var newSize = Number(currentSize);
    }
  }

  if( CMD == "default_jsp"){
     var newSize = defaultSize;
  }

  if( document.layers ){
    window.alert( "" );
    return false;
  }

  else if(( appName.indexOf("Mac",0) != -1 ) && ( uaName.indexOf("MSIE 4.0",0) != -1 )){
    window.alert( "Sorry! MacIE4.0 is not supported." );
    return false;
  }

  else if( document.body ){

    document.body.style.fontSize = newSize + fontSizeUnit;

    currentSize = newSize;

     if( CMD == "default" ){
     	 document.img_smaller.src 	= 'img/a_01.gif';
    	 document.img_default.src 	= 'img/a_02_a.gif';
    	 document.img_larger.src 	= 'img/a_03.gif';
     }else if( CMD == "larger" ){
     	 document.img_smaller.src 	= 'img/a_01.gif';
    	 document.img_default.src 	= 'img/a_02.gif';
         document.img_larger.src 	= 'img/a_03_a.gif';
	 }else if( CMD == "smaller"){
	 	 document.img_smaller.src 	= 'img/a_01_a.gif';
    	 document.img_default.src 	= 'img/a_02.gif';
    	 document.img_larger.src 	= 'img/a_03.gif';
     }else if( CMD == "default_jsp" ){
     	 document.img_smaller.src 	= '../img/a_01.gif';
    	 document.img_default.src 	= '../img/a_02_a.gif';
    	 document.img_larger.src 	= '../img/a_03.gif';
     }else if( CMD == "larger_jsp" ){
     	 document.img_smaller.src 	= '../img/a_01.gif';
    	 document.img_default.src 	= '../img/a_02.gif';
         document.img_larger.src	= '../img/a_03_a.gif';
	 }else if( CMD == "smaller_jsp"){
	 	 document.img_smaller.src 	= '../img/a_01_a.gif';
    	 document.img_default.src 	= '../img/a_02.gif';
    	 document.img_larger.src 	= '../img/a_03.gif';
     }
  }
 
}