function resize()
  {
    min=0.8;
    max=2.5;
    
    //theBody=document.getElementById('main_content');
    theBody=document.body;
    
    currentfSize=theBody.style.fontSize;
    
    if(!currentfSize)
      currentfSize=min;
    else
      currentfSize=currentfSize.replace('em','')
    
    currentfSize=currentfSize*1.5;
     
    if(currentfSize>=max)
      currentfSize=min;
    
    theBody.style.fontSize=currentfSize+"em";
    //alert(theBody.style.fontSize=currentfSize+"em");
  }