function handleClick() {
//function for turning images on and off
//first define variables for images that are to be hidden
var img1_off = document.getElementById('cm_banner').style.visibility; 
var img2_off = document.getElementById('cm_right').style.visibility; 
//var img3_off = document.getElementById('cm_care').style.visibility; 
//Keep adding img_off vars as required

//Next test that imgs are not hidden first then hide them
if ( img1_off != "hidden" && img2_off != "hidden" )
    {
    document.getElementById('cm_banner').style.visibility =  "hidden";  
    document.getElementById('cm_right').style.visibility  =  "hidden";
    //document.getElementById('cm_care').style.visibility   =  "hidden";
    }
//Or else make them visible again
  else 
    {
    document.getElementById('cm_banner').style.visibility =  "visible";
    document.getElementById('cm_right').style.visibility  =  "visible";
    //document.getElementById('cm_care').style.visibility   =  "visible";
    }
}

function showdesc() 
    {
  //function used to show image LONGDESC's 
    document.getElementById('image1').style.visibility    = "visible";  
    }
    
function showdesc2() 
    {
    document.getElementById('image2').style.visibility    =  "visible";  
    }
    
function showdesc3() 
    {
    //document.getElementById('image3').style.visibility    =  "visible";  
    }

function hidedesc() 
    {
  //function used to hide image LONGDESC's
    document.getElementById('image1').style.visibility    = "hidden";
    }
    
function hidedesc2() 
    {
    document.getElementById('image2').style.visibility    =  "hidden";
    }

function hidedesc3() 
    {
    //document.getElementById('image3').style.visibility    =  "hidden";
    }