function swapImage(element, newimage) {
	var oldsrc = element.src
	element.src = newimage
	if (!element.onmouseout)
		element.onmouseout = function (event) { swapImage(this, oldsrc); };
}

function getAdr(prefix, postfix, text) {
	document.write('<a href="mailto:' + prefix + '@' + postfix + '">' + (text ? text.replace(/&quot;/g, '"').replace(/%EMAIL%/, prefix + '@' + postfix) : prefix + '@' + postfix) + '</a>');
}

function popup(url,typ,para1,width,height) {
	 attrib="";
	Y=(screen.height-width)/2;
	X=(screen.width-height)/2;
	X=Math.round(X);
	Y=Math.round(Y);
	if (para1=='CENTER') {attrib+='height='+height+',width='+width+',top='+Y+',left='+X;}
	if (typ=='TYP1') {attrib+=",scrollbars=no";}
	if (typ=='TYP2') {attrib+=",scrollbars=yes";}
	if (typ=='TYP3') {attrib+=",scrollbars=yes,menubar=yes";}
	x=Math.random();
	fenster=window.open(url,'win',attrib);
	return false;
}

//Diverse Elemente bei kleiner Fenstergröße verändern
function check_resolution() {
	//array aus IDs die ausgeblendet werden sollen
	var array = new Array('author');
	var obj;

	if (document.body.offsetWidth < 995) {
		for(i = 0; i < array.length; i++) {
			obj = document.getElementById(array[i])
			if(obj)
				obj.style.display = 'none'
		}
		if (document.getElementById('container')) {document.getElementById('container').style.width = '640px';}
		if (document.getElementById('contactinfo')) {document.getElementById('contactinfo').style.paddingLeft = '10px';}
		if (document.getElementById('functions')) {document.getElementById('functions').style.bottom = '15px';}

		if (document.getElementById('contactinfo_start')) {
			spans = document.getElementById('contactinfo_start').getElementsByTagName('span');
			for (i=0; i< spans.length; i++) {
				if (spans[i].className == 'contactinfo_fax') {
					spans[i].style.display = 'none';
				}
			}
		}

	} else {
		for(i = 0; i < array.length; i++) {
			obj = document.getElementById(array[i])
			if(obj)
				obj.style.display = ''
		}
		if (document.getElementById('container')) {document.getElementById('container').style.width = '828px';}
		if (document.getElementById('contactinfo')) {document.getElementById('contactinfo').style.paddingLeft = '190px';}
		if (document.getElementById('functions')) {document.getElementById('functions').style.bottom = '5px';}

		if (document.getElementById('contactinfo_start')) {
			spans = document.getElementById('contactinfo_start').getElementsByTagName('span');
			for (i=0; i< spans.length; i++) {
				if (spans[i].className == 'contactinfo_fax') {
					spans[i].style.display = 'inline';
				}
			}
		}
	}
}
window.onresize = window.onload = check_resolution;

// 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, '');
}

//checkEmail - needed for forms
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) == '*') {
				label = label.substring(0, label.length - 1).trim();
				// 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 + ' 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 + ' ' + 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);
}