/*   config   */
uaName = navigator.userAgent;
appName = navigator.appVersion;


/*   user config   */
var fontSizeUnit = "%";
var perOrder = 20;
var defaultSize = 100;
var currentSize = defaultSize;


/*  start script  */
function fsc( CMD ){

  if( CMD == "larger" ){
    var newSize = Number(currentSize + perOrder);
  }
  
  if( CMD == "smaller" ){
    if ( currentSize != perOrder ){
      var newSize = Number(currentSize - perOrder);
    }
    else{
      var newSize = Number(currentSize);
    }
  }
  
  if( CMD == "default" ){
    var newSize = defaultSize;
  }


  /*   browser check   */
  if( document.layers ){
    window.alert( "このスクリプトはNetscape Communicator4.xでは動作しません" );
    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 ){
  	if( newSize <= 200 && newSize >= 50){
	    document.body.style.fontSize = newSize + fontSizeUnit;
	    currentSize = newSize;
	}
  }
  
}
// _______________________________________ end of function fsc() ___ 

//EOF