function DeleteConfirmation(obj) {
	if (CheckedCheckbox(obj))
		return confirm('Do you want to delete the selected elements? Deleting them you will '
					+ 'also delete their related information in the whole application.');
	else return false;
}

function CheckedCheckbox(obj) {
	if (obj) {
		if (typeof obj.length != 'undefined') {
			for (i = 0; i < obj.length; i++) {
				if (obj[i].checked) {
					return true;
			 	}
		  	}
			return false;
		} else {
			if (obj.checked) return true;
			else return false;
		}
	} else {
		return false;
	}
}

function ToggleObject(obj) {
	var el = document.getElementById(obj);
	el.style.display = (el.style.display != 'none' ? 'none' : '');
}

function ToggleTable(obj, ico) {
	var el = document.getElementById(obj);
	el.style.display = (el.style.display != 'none' ? 'none' : '');
	var ico = document.getElementById(ico);
	ico.src = (ico.src != 'http://www.genderandscience.org/img/toggle2.gif' ? '../img/toggle2.gif' : '../img/toggle1.gif');
}

function UnselectAll(obj) {
	document.getElementById(obj).selectedIndex = -1
}

function SelectAll(obj) {
	selectBox = document.getElementById(obj);
	for (var i = 0; i < selectBox.options.length; i++)
		selectBox.options[i].selected = true;
}