//global variables that can be used by ALL the function son this page.
var inputs;
var imgFalse = '/Images/false.png';
var imgTrue = '/Images/true.png';

//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
	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');

			var imgSrc = inputs[i].getAttribute('value').replace("|","");

			//check if the checkbox is checked
			if (inputs[i].checked) {
				img.src = "/Images/"+imgSrc+"_true.jpg";
				//img.src = imgTrue;
			} else {
				img.src = "/Images/" + imgSrc + "_false.jpg";
				//img.src = imgFalse;
			}

			//set image ID and onclick action
			img.id = 'checkImage' + i;
			img.setAttribute("style", "cursor: pointer;");
			//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) {
	var imgSrc = inputs[i].getAttribute('value').replace("|", "");
	if (inputs[i].checked) {
		inputs[i].checked = '';
		document.getElementById('checkImage' + i).src = "/Images/" + imgSrc + "_false.jpg";
	} else {
		inputs[i].checked = 'checked';
		document.getElementById('checkImage' + i).src = "/Images/" + imgSrc + "_true.jpg";
	}
	SetPortfCats();
}