function toggle(e,obj) {
 var e=window.event;
  
 if( document.getElementById(obj).className=='swapDIV' ){
	document.getElementById('intro').className = 'intro_vis';
   document.getElementById(obj).className = 'swapDIVswap';
 }else{
   document.getElementById('intro').className = 'intro_hidden';
   document.getElementById(obj).className = 'swapDIV';
 }
 
 
}