//global variables that can be used by ALL the functions on this page.
var inputs;
var imgFalse = 'http://www.linux-index.org/images/false.gif';
var imgTrue = 'http://www.linux-index.org/images/true.gif';

//this function runs when the page is loaded, put all your other onload stuff in here too.
function init() {
	replaceChecks();
	document.getElementsByName('q')[0].focus();
}

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
			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 collect_values() {

	var chck_txt;
	chck_txt = '';

	document.getElementsByName('q')[1].value = '';

	for(var i=0; i < inputs.length; i++) {
		if(inputs[i].getAttribute('type') == 'checkbox') {
			if(inputs[i].checked) {
 				if(chck_txt == '') {
 					chck_txt = inputs[i].value;
 				} else {
 					chck_txt = chck_txt + ' OR ' + inputs[i].value;
 				}
			}
		}
	}

	document.getElementsByName('q')[1].value = document.getElementById('s1').value + ' ' + chck_txt;
}

function errorMsg() {
	alert("Mozilla or Mozilla Firefox is needed to install this search plugin");
}

function addEngine(name,ext,cat) {

	if ((typeof window.sidebar == "object") && (typeof window.sidebar.addSearchEngine == "function")) {
		window.sidebar.addSearchEngine("http://www.linux-index.org/misc/"+name+".src", "http://www.linux-index.org/misc/"+name+"."+ext,name,cat);
	}
	else {
		errorMsg();
	}
}

//window.onload = init;