//global variables that can be used by ALL the function son this page.
var inputs;
var imgFalse = 'pics/acc_unchecked.jpg';
var imgTrue = 'pics/acc_checked.jpg';
var imgFalse_pushed = 'pics/acc_unchecked-pushed.jpg';
var imgTrue_pushed = 'pics/acc_checked-pushed.jpg';

//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') == 'checkbox') {
			
			//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 class
			img.className = 'check_img';			
			
			img.setAttribute('style',"margin:0px 0px 0px 0px; padding:0px 0px 0px 0px;");
				
			//set image 			
			img.onclick = new Function('checkChange('+i+')');	
			img.onmousedown = new Function('checkPush('+i+')');
			//img.onclick = new Function('inputs[i].onclick');
			//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;
		inputs[i].onchange();
	} else {		
		inputs[i].checked = 'checked';
		document.getElementById('checkImage'+i).src=imgTrue;
		inputs[i].onchange();
	}
}

function checkPush(i) {
	if(inputs[i].checked) {
		document.getElementById('checkImage'+i).src=imgTrue_pushed;		
	} else {				
		document.getElementById('checkImage'+i).src=imgFalse_pushed;		
	}
}

window.onload = init;