// JavaScript Document

	function byId(id) {
		return document.getElementById(id);
	}
	
	var resObject = null;
	resObject = erzeugeXMLHttpRequestObject();
	
	function erzeugeXMLHttpRequestObject() {
		var resObject = null;
		try {
			resObject = new ActiveXObject("Microsoft.XMLHTTP");	
		}
		catch(Error) {
			try {
				resObject = new ActiveXObject("MSXML2.XMLHTTP");
			}
			catch(Error) {
				try {
					resObject = new XMLHttpRequest();
				}
				catch(Error) {
					alert("Dieser Browser bietet leider keine AJAX Funktionalität");
				}
			}
		}
		return resObject;
	}
	
	function vote(img) {
		var id = img.getAttribute('id').toString();
		var under_pos = id.indexOf('_'); // underscore determines between item id and vote value
		var item_id = id.substr(4, under_pos-4); // get item id
		var vote_value = id.substr(under_pos+5); // get vote value
		var rand = Math.random();
		resObject.open("get", "voting/vote.php?id="+id+"&item_id="+item_id+"&vote_value="+vote_value+"&r="+rand, true);
		resObject.onreadystatechange = handleResponse_voting;	
		resObject.send(null);
	}

	function handleResponse_voting() {
		if (resObject.readyState == 4) {
			var response = resObject.responseText;
			if (response != false) {
				var info_array = response.split("|||");
				byId('item_'+info_array[0]+'_av').innerHTML = number_format (info_array[1], 2, ".");
				byId('item_'+info_array[0]+'_v').innerHTML = info_array[2];
			}
		}
	}

function handleMouseover(img) {
	var id = img.getAttribute('id').toString();
	var under_pos = id.indexOf('_'); // underscore determines between item id and vote value
	var item_id = id.substr(4, under_pos-4); // get item id
	clearAverage(item_id); // Clear voting average
	var vote_value = id.substr(under_pos+5); // get vote value
	//alert('item: '+item_id+' : vote: '+vote_value);
	for (i = vote_value; i > 0; i--) {
		var vote_img = document.getElementById('item'+item_id+'_vote'+i);
		vote_img.src = 'voting/voting_'+i+'.gif';
	}
	var current_vote = new Array("-", "schlecht", "geht so", "durchschnitt", "gut", "genial");
	byId('current_vote').innerHTML = current_vote[vote_value];
}

function handleMouseout(img) {
	var id = img.getAttribute('id').toString();
	var under_pos = id.indexOf('_'); // underscore determines between item id and vote value
	var item_id = id.substr(4, under_pos-4); // get item id
	var vote_value = id.substr(under_pos+5); // get vote value
	for (i = 5; i > 0; i--) {
		var vote_img = document.getElementById('item'+item_id+'_vote'+i);
		vote_img.src = "voting/voting_clear.gif";
	}
	byId('current_vote').innerHTML = " ";
	showAverage(item_id, byId('voting'+item_id).getAttribute('title'));
}

function showAverage(item, average) {
	var thisVoting = byId('voting'+item);
	var img = thisVoting.getElementsByTagName('img');
	for (i=0;i<Math.floor(average);i++) {
		img[i].src = "voting/voting_"+(i+1)+".gif";
	}
}

function clearAverage(item) {
	var thisVoting = byId('voting'+item);
	var img = thisVoting.getElementsByTagName('img');
	for (i=0;i<img.length;i++) {
		img[i].src = "voting/voting_clear.gif";
	}
}

function showHelper(img) {
	var id = img.getAttribute('id').toString();
	var item_id = parseInt(id.substr(5, id.lastIndexOf('_')+1)); // z.b. 2 oder 45234
	byId('voting_helper_'+item_id).style.display = 'block';
	byId('voting_helper_'+item_id).style.visibility = 'visible';
}

function hideHelper(img) {
	var id = img.getAttribute('id').toString();
	var item_id = parseInt(id.substr(5, id.lastIndexOf('_')+1)); // z.b. 2 oder 45234
	byId('voting_helper_'+item_id).style.display = 'none';
	byId('voting_helper_'+item_id).style.visibility = 'hidden';
}


function number_format (number, decimals, dec_point, thousands_sep)
{
 if (isNaN(number))
 	return -1;
 else {
	 var exponent = "";
		var numberstr = number.toString ();
		var eindex = numberstr.indexOf ("e");
		if (eindex > -1)
		{
			exponent = numberstr.substring (eindex);
			number = parseFloat (numberstr.substring (0, eindex));
		}
		
		if (decimals != null)
		{
			var temp = Math.pow (10, decimals);
			number = Math.round (number * temp) / temp;
		}
		var sign = number < 0 ? "-" : "";
		var integer = (number > 0 ? 
				Math.floor (number) : Math.abs (Math.ceil (number))).toString ();
		
		var fractional = number.toString ().substring (integer.length + sign.length);
		dec_point = dec_point != null ? dec_point : ".";
		fractional = decimals != null && decimals > 0 || fractional.length > 1 ? 
								 (dec_point + fractional.substring (1)) : "";
		if (decimals != null && decimals > 0)
		{
			for (i = fractional.length - 1, z = decimals; i < z; ++i)
				fractional += "0";
		}
		
		thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
										thousands_sep : null;
		if (thousands_sep != null && thousands_sep != "")
		{
		for (i = integer.length - 3; i > 0; i -= 3)
				integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
		}
		
		return sign + integer + fractional + exponent;
 }
}