//global variables that can be used by ALL the function son this page.
var inputs = new Array();
var imgFalse = '/img/research/mir/checkbox_off.gif';
var imgTrue = '/img/research/mir/checkbox_on.gif';

//this function runs when the page is loaded, put all your other onload stuff in here too.


function replaceChecks() {
  
//get all the input fields on the page
for (var j=1; j <= 9; j++) {
var bodyStyle = 'body_style' + (j);
inputs[j] = document.getElementById(bodyStyle);
}

//cycle trough the input fields
for(var i=1; i < inputs.length; i++) {

//check if the input is a checkbox
if(inputs[i].getAttribute('type') == 'checkbox') {

//create a new image
var img = new Image(12,12);

//check if the checkbox is checked
if(inputs[i].checked) {
img.src = imgTrue;
} else {
img.src = imgFalse;
}

//set image ID and onclick action
img.id = 'checkImage'+i;
//set image 
img.onclick = new Function('checkChange('+i+')');
//place image in front of the checkbox
inputs[i].parentNode.insertBefore(img, inputs[i]);

//hide the checkbox
inputs[i].style.display='none';
}
}

}

//change the checkbox status and the replacement image
function checkChange(i) {

if(inputs[i].checked) {
inputs[i].checked = '';
document.getElementById('checkImage'+i).src=imgFalse;
      
} else {
inputs[i].checked = 'checked';
document.getElementById('checkImage'+i).src=imgTrue;
 
}
    bodyStyleChanged(true) ;
   
}