// JavaScript Document
//global variables that can be used by ALL the functions on this page.
var inputs;
var imgFalse = 'images/checkbox_empty.png';
var imgTrue = 'images/checkbox_full.png';

//this function runs when the page is loaded, put all your other onload stuff in here too.
function init() {
	replaceChecks();
}

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].getAttribute('type') == 'radio') {
			
			//create a new image
			var img = document.createElement('img');
			
			// add a class to make the onmouseover a pointer
			img.setAttribute('class', 'pointer');
			//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;	
	}
}

function falseChecks() {
	document.getElementById('checkImage1').src = imgFalse;
	document.getElementById('checkImage2').src = imgFalse;
	document.getElementById('checkImage3').src = imgFalse;
	document.getElementById('checkImage4').src = imgFalse;
	document.getElementById('checkImage5').src = imgFalse;
	document.getElementById('checkImage6').src = imgFalse;
	document.getElementById('checkImage7').src = imgFalse;
	document.getElementById('checkImage8').src = imgFalse;
	document.getElementById('checkImage9').src = imgFalse;
	document.getElementById('checkImage10').src = imgFalse;
	document.getElementById('checkImage11').src = imgFalse;
	document.getElementById('checkImage12').src = imgFalse;
	document.getElementById('checkImage13').src = imgFalse;
	document.getElementById('checkImage14').src = imgFalse;
	document.getElementById('checkImage15').src = imgFalse;
}