function getUrlVars() {
	//Wandelt mit Regex die GET Parameter der URL in ein lesbareres Format um
	var vars = {};
	var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
	vars[key] = value;
	});
	return vars;
}

function setCookie(cname, cvalue, exdays) {
	var d = new Date();
	d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
	var expires = "expires="+d.toUTCString();
	document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
function getCookie(cname) {
	var name = cname + "=";
	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);
		}
		if (c.indexOf(name) == 0) {
			return c.substring(name.length, c.length);
		}
	}
	return "";
}

		var erster_lauf = getUrlVars()["start"];
		var use_workaround = false; 
		
		if (use_workaround && erster_lauf===undefined) {
			if (getCookie('fixed')=="") {
				setCookie('fixed', 'fixed', 365); // 1 year
				window.top.location.replace("https://00026.webseminare.biz/index.php?set_cookie=1"); 
			}
		}
		
function receiveMessage(event) {
    var message = event.data.split(':');
    var eventName = message[0];
    var iframes, len, i = 0;
	var iframe_evidenz_obs;

    // only receive messages from this domain
    var senderDomains = ['http://00026.webseminare.biz', 'https://00026.webseminare.biz', 'https://ssl.webpack.de', 'http://www.webseminare.biz', 'https://www.webseminare.biz'];

    if ( senderDomains.indexOf(event.origin) !== -1 && eventName === 'resize' ) {
		
		   iframe_evidenz_obs = document.getElementById('evidenz_obs');
			
			if(iframe_evidenz_obs == null){

				iframes = document.getElementsByTagName('iframe');
				
				//Fallback falls das obs iframe keine ID hat. Funktioniert widerum nur wenn es das erste iframe ist
				if ( ( iframes[0].contentWindow || iframes[0].documentWindow ) == event.source) {
					iframes[0].style.height = message[1] + "px";       // Get Left Position
					  
										return;
				}
				
			}else{
			
				//passt die Größe des iframes mit der ID "evidenz_obs" an
				if ( ( iframe_evidenz_obs.contentWindow || iframe_evidenz_obs.documentWindow ) == event.source) {
					iframe_evidenz_obs.style.height = message[1] + "px";
					
										return;
				}
			}
		
    }else if(senderDomains.indexOf(event.origin) !== -1 && eventName === 'springen'){
		if (message[1]=='1'){
			// Get iframe Top Position
			var iframeY = window.parent.document.getElementById('evidenz_obs').offsetTop;
			window.scrollTo(0,iframeY);
		}else if (message[1]=='2'){
			window.scrollTo(0,0);
		}
	}
}

if ( window.addEventListener ) {
    window.addEventListener('message', receiveMessage, false);
} 
else if (window.attachEvent)  {
    window.attachEvent('onmessage', receiveMessage);
}