function changeClass(obj, new_class)
{
    obj.className = new_class;
}

function changeBgColor(obj, new_color)
{
	obj.style.backgroundColor=new_color;
}

function changePic(name, pic)
{
	name.src = pic;
}

function popup(url, name, width, height)
{
	left_pos = (screen.width / 2) - (width / 2);
	top_pos = (screen.height / 2) - (height / 2);
	popup_window = window.open(url, name, 'width=' + width + ',height=' + height + ',left=' + left_pos + ',top=' + top_pos);	
	popup_window.focus();
}

function cleanField(field, default_value)
{
	if (field.value == default_value) {
		field.value = '';
	}
}

function fillField(field, default_value)
{
	if (field.value == '') {
		field.value = default_value;
	}
}

function changeVisibilitiy(id)
{
	if (document.getElementById(id).style.display == 'none') {	
		document.getElementById(id).style.display = 'block';	
	} else {
		document.getElementById(id).style.display = 'none';	
	}
}

function canAddComment()
{
	validated = true;
	if (!document.getElementById('n_field').value) {
		validated = false;
	}
	if (!document.getElementById('e_field').value) {
		validated = false;
	}
	if (!document.getElementById('c_field').value) {
		validated = false;
	}
	return validated;	
}


function money(number)
{
	money_number = number.toFixed(2);	
	return money_number.replace( '.', ',');
}

function ajaxCall(url, params)
{
	xmlobj = null;	
	try
	{
		xmlobj=new XMLHttpRequest();
	}
	catch(e) {
		try
		{
			xmlobj=new ActiveXObject('Microsoft.XMLHTTP');
		}
		catch(e)
		{
			xmlobj=null;
			return false;
		}
	}
	xmlobj.open('POST', '/index.php?ajax=' + url, true);
	xmlobj.setRequestHeader('Content-Type','application/x-www-form-urlencoded');	
	xmlobj.onreadystatechange = function() {
		if (xmlobj.readyState == 4) {
			xmlobj.status == 200;
			if (xmlobj.responseText) {
				alert(xmlobj.responseText);
			}
		}
	}
	xmlobj.send(params);
}



			function get_radio_value(radio_obj) {
				if (!radio_obj) {
					return '';
				}
				var radio_length = radio_obj.length;
				if (radio_length == undefined) {
					if (radio_obj.checked) {
						return radio_obj.value;
					} else {
						return '';
					}
				}
				for (var i = 0; i < radio_length; i++) {
					if (radio_obj[i].checked) {
						return radio_obj[i].value;
					}
				}
				return '';
			}
			function validate_form(form, elements)
			{
				for (var i=0; i < elements.length; i++) {
					var element_name = elements[i];
					var element = form.elements[element_name];
					alert(element);
					if (element && !element.disabled) {
						var value = '';
						if ((element.type == 'radio') || (element[0] && (element[0].type == 'radio'))) {
							value = get_radio_value(element);
						} else {
							value = element.value;
						}
						if ((value == '') || (value == '0')) {
							alert('Prosimo, izpolnite obvezna polja!');
							if (element[0]) {
								element[0].focus();
							} else {
								element.focus();
							}
							return false;
						}
					}
				}
				return true;
			}
			
			function validate_fields (fields)
			{
				for (var i=0; i < fields.length; i++)
				{
					var element_name = fields[i];
					var temp = document.getElementById(element_name);

					if (temp && temp.value == '')
					{
						alert('Prosimo, izpolnite obvezna polja!');
						return false;
					}
				}
				return true;
			}