function displayFunctionElement(id) {

	obj = document.getElementById(id);
	if (obj) {
		if (!obj.style.display) {
			obj.style.display = 'none';
		}
		if (obj.style.display == 'none') {
			functionElements = new Array('search', 'fontsize');
			for (i=0; i<functionElements.length; i++) {
				if (document.getElementById(functionElements[i])) {
					document.getElementById(functionElements[i]).style.display = 'none';
				}
			}
			obj.style.display = 'block';
		} else {
			obj.style.display = 'none';
		}
	}
}

function searchValue(element, status) {
	if (status=='1' && element.value=='Suchbegriff...') {
		element.value='';
	} else {
		if (element.value=='') {
			element.value='Suchbegriff...';
		}
	}
}

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




/* Submenu */

function getSubnav(id) {
	hoversub = document.getElementById('sub_'+id);
	for (i=0; i<subnavids.length; i++) {
		if (document.getElementById(subnavids[i])) {
			document.getElementById(subnavids[i]).style.display = 'none';
		}
	}
	if (hoversub) {
		hoversub.style.display = 'block';
	}
}

function restoreSubNav() {
	obj = document.getElementById(activesub);
	for (i=0; i<subnavids.length; i++) {
		if (document.getElementById(subnavids[i])) {
			document.getElementById(subnavids[i]).style.display = 'none';
		}
	}
	if (obj) {
		obj.style.display = 'block';
	}
}




//Diverse Elemente bei kleiner Fenstergröße verändern
function check_resolution() {
	var obj=document.getElementById("container");

	/* Font-Size auslesen */
	if (document.body.currentStyle) {
		var fontsize = document.body.currentStyle['fontSize'];
	} else if (window.getComputedStyle) {
		var fontsize = document.defaultView.getComputedStyle(document.body, null).getPropertyValue('font-size');
	}

	if(obj) {
		if (document.body.offsetWidth < (68*parseInt(fontsize.split("px")[0]))) {
			obj.style.left="0";
			obj.style.right="0";
			obj.style.marginLeft="0";
			obj.style.width="auto";
		} else {
			obj.style.left="50%";
			obj.style.right="auto";
			obj.style.marginLeft="-34em";
			obj.style.width="68em";
		}

		/* Bei zu geringer Breite Logo verschieben */
		if (document.body.offsetWidth < ((68*parseInt(fontsize.split("px")[0]))+189)) {
			document.getElementById('logo').style.right='0';
		} else {
			document.getElementById('logo').style.right='-88px';
		}
	}
}
window.onkeyup=window.onclick=window.onresize=window.onload=check_resolution;




/* Ändert die font-size des body Tags. D.h. alle Angaben die skaliert werden sollen müssen relativ (in %) angegeben werden */
var busywaiter = window.setInterval(function() {
    if (document.body) {
        window.clearInterval(busywaiter);
        var nameEQ = "fontsize=";
        var ca = document.cookie.split(';');
        for(var i=0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) return document.body.style.fontSize = c.substring(nameEQ.length, c.length);
        }
    }
}, 10);


function changeFontSize(factor) {
    if (document.body.currentStyle)
        var fontsize = document.body.currentStyle['fontSize'];
    else if (window.getComputedStyle)
        var fontsize = document.defaultView.getComputedStyle(document.body, null).getPropertyValue('font-size');

    fontsize = /(\d+)(.+)/.exec(fontsize);
    document.body.style.fontSize = (parseInt(fontsize[1]) + factor) + fontsize[2];
    document.cookie = "fontsize=" + document.body.style.fontSize + "; path=/";
    setTimeout('document.body.innerHTML = document.body.innerHTML', 10);
    check_resolution();
}

function resetFontSize() {
    document.body.style.fontSize = '';
    document.cookie = "fontsize=;path=/";
    setTimeout('document.body.innerHTML = document.body.innerHTML', 10);
    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 && span.firstChild) {
			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);
}


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;
}