//global variables that can be used by ALL the function son this page.
var inputs;
var imgFalse = 'images/uncheck.jpg';
var imgTrue = 'images/check.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') == '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;
			img.onmouseover = new Function('roll('+i+')');
			img.style.cursor='pointer';
			img.style.height = 54;
			img.style.width = 49;
			//set image 
			img.onclick = new Function('checkChange('+i+')');
			img.onmouseout = new Function('checkMouseOut()');
			
			
			//place image in front of the checkbox
			inputs[i].parentNode.insertBefore(img, inputs[i]);
			
			//hide the checkbox
			inputs[i].style.display='none';
		}
	}
}


function roll(i)
   {
		/*var ctr=1;
		for(ctr=1;ctr<=4;ctr++){
			inputs[ctr].checked = false;
			document.getElementById('checkImage'+ctr).src=imgFalse;
		}
		if(inputs[i].checked) {
			inputs[i].checked = false;
			document.getElementById('checkImage'+i).src=imgFalse;
		} else {
			inputs[i].checked = true;
			document.getElementById('checkImage'+i).src=imgTrue;
		}*/
		var ctr=0;
		var tmp_i = i -1;
		var chk = document.pollform.flavor;
		for(ctr=0;ctr<chk.length;ctr++){
			if(chk[ctr].checked){	
				document.getElementById('checkImage'+(ctr + 1)).src=imgFalse;
			}
		}
		
		//if(!chk[tmp_i].checked){
		document.getElementById('checkImage'+i).src=imgTrue;
		//}
   }

//change the checkbox status and the replacement image
function checkChange(i) {
	/*var ctr=1;
	for(ctr=1;ctr<=4;ctr++){
		inputs[ctr].checked = false;
		document.getElementById('checkImage'+ctr).src=imgFalse;
	}
	if(inputs[i].checked) {
		inputs[i].checked = false;
		document.getElementById('checkImage'+i).src=imgFalse;
	} else {
		inputs[i].checked = true;
		document.getElementById('checkImage'+i).src=imgTrue;
	}*/
	
	var ctr=0;
	var tmp_i = i -1;
	var chk = document.pollform.flavor;
	for(ctr=0;ctr<chk.length;ctr++){
		chk[ctr].checked=false;
		document.getElementById('checkImage'+(ctr + 1)).src=imgFalse;
	}
	if(chk[tmp_i].checked){
		chk[tmp_i].checked=false;
		document.getElementById('checkImage'+i).src=imgFalse;
	}else{
		chk[tmp_i].checked=true;
		document.getElementById('checkImage'+i).src=imgTrue;
	}
}

function checkMouseOut(){
	var chk = document.pollform.flavor;
	for(ctr=0;ctr<chk.length;ctr++){
		if (chk[ctr].checked){
			chk[ctr].checked=true;
			document.getElementById('checkImage'+(ctr + 1)).src=imgTrue;
		}else{
			chk[ctr].checked=false;
			document.getElementById('checkImage'+(ctr + 1)).src=imgFalse;
		}
	}
}

window.onload = init;