//global variables that can be used by ALL the function son this page.
var inputs;
var imgFalse = '/img/checkbox_false.png';
var imgTrue = '/img/checkbox_true.png';

function replaceChecks() {
    
    //get all the input fields on the page
    inputs = document.getElementsByTagName('input');

    //cycle trough the input fields
    for(var i=0; i < inputs.length; i++) {

        //check if the input is a checkbox
        if(inputs[i].type == 'radio') {
            
            //create a new image
            var img = document.createElement('img');
            
            //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 = function(){checkChange(this.id.replace('checkImage',''));}//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) {
		inputs = document.getElementsByTagName('input');
		for(var ai=0; ai < inputs.length; ai++) {
			if(inputs[ai].type == 'radio') 
			{
				document.getElementById('checkImage'+ai).src=imgFalse;
				
			}
		}
	
	 if(inputs[i].checked) {
        inputs[i].checked = '';
        document.getElementById('checkImage'+i).src=imgFalse;
    } else {
        inputs[i].checked = 'checked';
        document.getElementById('checkImage'+i).src=imgTrue;
    }
}