// deletes leading and trailing spaces in a string - adds the function directly to the String Object, so that all strings inherit this method
// String.prototype.trim = function() {
//     return this.replace(/(^\s*)|(\s*$)/g, '');
// }

function checkEmail(val) {
	if (val) {
		var usr = "([a-zA-Z0-9][a-zA-Z0-9_.-]*|\"([^\\\\\x80-\xff\015\012\"]|\\\\[^\x80-\xff])+\")";
		var domain = "([a-zA-Z0-9][a-zA-Z0-9._-]*\\.)*[a-zA-Z0-9][a-zA-Z0-9._-]*\\.[a-zA-Z]{2,5}";
		var regex = "^"+usr+"\@"+domain+"$";
		var myrxp = new RegExp(regex);
		var check = (myrxp.test(val));
		if (check!=true) {
			return false;
		}
		else {
			return true;
		}
	}
}

/*
validates formfields if they have a value or not
to check for other options do the following
specialfields = new Object();
specialfields.fieldname = new Object();
specialfields.fieldname.check1 = 'function_to_call,error_message';
specialfields.fieldname.check2 = 'second_function_to_call,second_error_message';
specialfields.another_fieldname = new Object();
specialfields.another_fieldname.check1 = 'function_to_call,error_message';
*/
function validateForm(form,specialfields) {
	var errors = new Array();
	var fields = form.getElementsByTagName('label');
	for (i = 0; i < fields.length; i++) {
		var span = fields[i].getElementsByTagName('span')[0];
		if (span) {
			var label = span.firstChild.data;
			label = label.trim();
			// if there is a '*' in the label - this indicates the inputfield has to be filled
			if (label.charAt(label.length - 1) == '*'){
				// get the inputfield
				var obj_input = fields[i].getElementsByTagName('input');
				if (!obj_input[0])
					obj_input = fields[i].getElementsByTagName('select');
				if (!obj_input[0])
					obj_input = fields[i].getElementsByTagName('textarea');

				// if there is an inputfield
				if (obj_input && obj_input[0]) {
					input = obj_input[0];
					error = false;
					
					// check if the inputfield has a value
					if (!input.value || input.value.trim().length==0) {
						error = true;
						errors.push(label.substring(0, label.length -1) + ' nicht eingegeben');
					}
					
					// check the inputfield for special things (email, ...)
					if (!error && specialfields[input.name]){
						specialfield = specialfields[input.name];
						for (check in specialfield){
							check_function = specialfield[check].split(',')[0];
							check_message = specialfield[check].split(',')[1];
							if (!eval(check_function)(input.value)){
								error = true;
								errors.push(label.substring(0, label.length -1) + check_message);
							}
						}
					}
		            
					// on error give the label the className 'error' otherwise delete the className 'error' (if exists)
					if (error){
						className = fields[i].className;
						if (className.length>0){
							className = className + ' ';
						}
						fields[i].className = className + 'error';
					} else {
		            	className = fields[i].className;
		                if (className.indexOf('error')>-1){
							className = className.replace(' error', '');
							className = className.replace('error', '');
							fields[i].className = className;
						}
		            }
				}
			}
		}
	}
    return errors;
}

function showFormErrors (errors) {
	error_message = '';
	for (i=0;i<errors.length;i++){
		error_message += errors[i] + '\n';
	}
	alert(error_message);
}

window_loaded = false;
var my_oldonload = window.onload;
window.onload = function () {
    window_loaded = true;
    if (window.ie){
        obj_flash = document.getElementById('flash');
        if (obj_flash){
            obj_flash.innerHTML = obj_flash.innerHTML;
            obj_flash.style.visibility = 'visible';
        }
    }
    if (my_oldonload) {my_oldonload();}
}

window.onresize = window_onresize;
function window_onresize(){
    if (window_loaded){
        if (myReference && Reference_started){
            myReference.onResize();
        }
        if (myGallery && Gallery_started){
            myGallery.onResize();
        }
    }
}


function hideSelectBoxes(){
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) { selects[i].style.visibility = "hidden";}
}


function showSelectBoxes(){
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) { selects[i].style.visibility = "visible";}
}