//Schriftgroesse veraendern
function insertRule(ss, selector, rule, position) {
	if(ss.insertRule)
	ss.insertRule(selector + '{' + rule + '}', position);
	else if(ss.addRule)
	ss.addRule(selector, rule);
}

var busywaiter = window.setInterval(function() {

	var theRules = new Array();
	var ss = document.styleSheets[1];
	if (ss.cssRules)
		theRules = ss.cssRules;
	else if (ss.rules)
		theRules = ss.rules;

	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) {
				document.getElementById('content').style.fontSize = c.substring(nameEQ.length, c.length);
				return insertRule(ss, '#content *', 'font-size: '+c.substring(nameEQ.length, c.length)+';', theRules.length);
			}
		}
	}
}, 10);

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

	fontsize = /(\d+)(.+)/.exec(fontsize);
	fontsize = (parseInt(fontsize[1]) + x) + fontsize[2];

	document.getElementById('content').style.fontSize = fontsize;

	document.cookie = "fontsize=" + fontsize + "; path=/";

	var theRules = new Array();
	var ss = document.styleSheets[1];
	if (ss.cssRules)
		theRules = ss.cssRules;
	else if (ss.rules)
		theRules = ss.rules;

	insertRule(ss, '#content *', 'font-size: '+fontsize+';', theRules.length);
}

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

	if (document.body.offsetHeight < 650) {
		for(i = 0; i < array.length; i++) {
			obj = document.getElementById(array[i])
			if(obj)
				obj.style.display = 'none'
			if(font_functions)
				font_functions.style.bottom='124px';
		}
	} else {
		for(i = 0; i < array.length; i++) {
			obj = document.getElementById(array[i])
			if(obj)
				obj.style.display = ''
			if(font_functions)
				font_functions.style.bottom='214px'
		}
	}

	if(font_functions)
		font_functions.style.display='block';

}
window.onresize = window.onload = check_resolution;

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

function swapImage(element, newimage) {
	var oldsrc = element.src
	element.src = newimage
	if (!element.onmouseout)
		element.onmouseout = function (event) { swapImage(this, oldsrc); };
}
// Leerzeichen hinten und vorne bei einem String Objekt wegschneiden
function trim(string) {
	return string.replace(/^\s*|\s*$/,'');
}

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 = trim(label)
			// 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 || trim(input.value).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);
}

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;
}

function truebody(){
	return document.getElementsByTagName('body')[0]
}

function hoverPic(image, newsrc) {
	img = document.createElement("img")
	img.id = 'hoverpic'
	img.src = newsrc
	img.style.display='none'
	truebody().appendChild(img)
	document.onmousemove = function(e) {followmouse(e, img)}
	image.onmouseout = function() {
		image.onmouseout = ''
		document.onmousemove = ''
		truebody().removeChild(img)
	}
}

function followmouse(e, img){
    img.style.display='block'
    var xcoord = 30
    var ycoord = 20
    if (typeof e != "undefined") {
        xcoord += e.pageX
        ycoord += e.pageY
    } else if (typeof window.event !="undefined") {
        xcoord += truebody().scrollLeft + event.clientX
        ycoord += truebody().scrollTop + event.clientY
    }

    if(xcoord + img.offsetWidth > document.body.offsetWidth && ycoord + img.offsetHeight > document.body.offsetHeight)
    {
        xcoord -= (img.offsetWidth + 50)
        ycoord = document.body.offsetHeight - img.offsetHeight
    }

    if(ycoord + img.offsetHeight > document.body.offsetHeight)
    {
        ycoord = document.body.offsetHeight - img.offsetHeight
    }

    if(xcoord + img.offsetWidth > document.body.offsetWidth)
    {
        xcoord = document.body.offsetWidth - img.offsetWidth
    }

    img.style.left = xcoord + "px"
    img.style.top = ycoord + "px"
}