function menuSelection(id){
  	enable(currentId)
  	disable(id)
  	load(id)
	}
	
  function enable(id) {
   	option = document.getElementById(id)
  	if(option) {
  		option.className="normal"
	  	option.onmouseover=function(){this.className='hover'}
	  	option.onmouseout=function(){this.className='normal'}
	  	option.onclick=function(){menuSelection(this.id)}
  	}
  }
  
  function disable(id) {
  	option = document.getElementById(id)
  	if(option) {
	  	option.className="current"
	  	option.onmouseover=function(){this.className='current'}
	  	option.onmouseout=function(){this.className='current'}
	  	option.onclick=
	  	currentId = id
	  }
  }
   
  
  function load(id) {
  	frame = document.getElementById("content")
  	if(frame) {
  		frame.src=menuOptionToContent[id]
  	}
  }