var TextZoom = new Object();

TextZoom.In = function()
{
    for(var i=0; i<arguments.length; i++)
    {
       var id = arguments[i];
       var currentSize = parseInt(document.getElementById(id).style.fontSize);
       
       if(currentSize < 24)
       {
           document.getElementById(id).style.fontSize = (currentSize+1)+'px';
           
           var currentLineHeight = parseInt(document.getElementById(id).style.lineHeight);
           document.getElementById(id).style.lineHeight = (currentLineHeight+1)+'px';
       }
    }
}

TextZoom.Out = function()
{
    for(var i=0; i<arguments.length; i++)
    {
       var id = arguments[i];
       var currentSize = parseInt(document.getElementById(id).style.fontSize);
    
       if(currentSize > 10)
       {
           document.getElementById(id).style.fontSize = (currentSize-1)+'px';
              
           var currentLineHeight = parseInt(document.getElementById(id).style.lineHeight);
           document.getElementById(id).style.lineHeight = (currentLineHeight-1)+'px';
       }
    }
}