/**
 * Create a custom overlay for the either the specified object, or the entire contents
 */
function $overlay(show, obj) {
 	var overlay = $('overlay');
 	if (!overlay) {
 		overlay = new Element('div', {
 			'id': 'overlay',
 			'class': 'overlay',
 			'styles': {
				'position': 'absolute',
				'zIndex': 99
			}
 		});
		overlay.inject(document.body);
 	};
 	var coord = null;
 	if (!obj)
 		coord = $merge($('Contents').getCoordinates(), {'height': '100%'});
 	else
 		coord = obj.getCoordinates();
	overlay.setStyles(coord);
		
 	window.scrollTo(0,0);
 	overlay.setStyle('display', show?'':'none');
	document.body.setStyle('overflow', show?'hidden':'auto');
 	overlay = null;
}

/**
 * Add function for getting the value of an object.  Object can be passed either as a direct
 * reference to the object, or as a string which will be used on form[0] to find the field
 * @param obj Can be either the text name of the field, or the actual field itself
 * @param index, optional.  The index of the form, on which the field exists.  Defaults to 0
*/
function $v(obj, index) {
	var obj0 = obj;
	if (typeof obj == 'string')
		obj0 = $(obj);
	if (!obj0)
		if (!index) {
			obj0 = eval('document.forms[0].' + obj);
		} else {
			obj0 = eval('document.forms[' + index + '].' + obj);
		}
	obj = obj0;
	
	if (!obj)
		return null;
	var tmp;
	switch (obj.type) {
	case 'hidden':
	case 'text':
	case 'textarea':
		// treat hidden and text items as the same type as both will only contain text
		tmp = obj.value;
		break;
	case 'select-one':
		// treat a single select as a special case.  The first value is always assumed to be an empty select.
		tmp = ($defined(obj.options[obj.selectedIndex].value)?obj.options[obj.selectedIndex].value:obj.options[obj.selectedIndex].text)
		break;
	case 'select-multiple':
		// check that at least one value is selected using helper function
		tmp = new Array();
		for (i=0; i<obj.options.length; i++) {
			if (obj.options[i].selected) {
				tmp[tmp.length]=($defined(obj[i].value)?obj[i].value:obj[i].text);
			}
		}
		break;
	default:
		if ($type(obj)=='array' || $type(obj)=='collection') {
			tmp = new Array();
			for (var i=0; i<obj.length; i++) {
				if (obj[i].checked) {
					tmp[tmp.length]=(obj[i].value?obj[i].value:obj[i].text?obj[i].text:'');
				}
			}
		} else {
			tmp = (obj.checked?($defined(obj.value)?obj.value:obj.text):"");
		}
		break;
	}
	return tmp;
}

/**
 * Set the specified value for the given field
 * @param obj Can be either the text name of the field, or the actual field itself
 * @param v the value to set, check or select
 * @param index, optional.  The index of the form, on which the field exists.  Defaults to 0
 */
function $s(obj, v, index) {
	var obj0 = obj;
	if (typeof obj == 'string')
		obj0 = $(obj);
	if (!obj0)
		if (!index) {
			obj0 = eval('document.forms[0].' + obj);
		} else {
			obj0 = eval('document.forms[' + index + '].' + obj);
		}
	obj = obj0;
	
	if (!obj)
		return null;
	var tmp;
	switch (($type(obj)=='array' || $type(obj)=='collection') ? obj[0].type : obj.type) {
	case 'hidden':
	case 'text':
	case 'textarea':
		// treat hidden and text items as the same type as both will only contain text
		obj.value = v;
		break;
	case 'select-one':
	case 'select-multiple':
		// check that at least one value is selected using helper function
		tmp = new Array();
		for (i=0; i<obj.options.length; i++) {
			if ($type(v)=='array' || $type(v)=='collection') {
				for (var j=0;j<v.length;j++) {
					obj[i].selected =  ( ($defined(obj[i].value)?obj[i].value:obj[i].text) == v[j] );
				}
			} else {
				obj[i].selected =  ( ($defined(obj[i].value)?obj[i].value:obj[i].text) == v );
			}
		}
		break;
	default:
		if ($type(obj)=='array' || $type(obj)=='collection') {
			tmp = new Array();
			for (var i=0; i<obj.length; i++) {
				if ($type(v)=='array' || $type(v)=='collection') {
					for (var j=0;j<v.length;j++) {
						obj[i].checked =  ( ($defined(obj[i].value)?obj[i].value:obj[i].text) == v[j] );
					}
				} else {
					obj[i].checked =  ( ($defined(obj[i].value)?obj[i].value:obj[i].text) == v );
				}
			}
		} else {
			obj.checked =  ( ($defined(obj.value)?obj.value:obj.text) == v );
		}
		break;
	}
}

var isNumberKey = function(e){
    if (e.code > 31 && (e.code < 48 || e.code > 57)) 
        return false;   
    return true;
};

var isBackSpaceKey = function(e){
    return e.code == 8;
};

var isArrowKey = function(e) {
    return e.code >= 37 && e.code <= 40;
};