window.onload=function() {
	my_iframe = document.getElementById("wechseln_iframe");
	my_iframeDiv = document.getElementById("iframe");
	my_iframeButton = document.getElementById("iframeButton");
	
	my_iframeClose  = function () {
		my_iframe.height = "3px";
		my_iframeButton.onclick= my_iframeOpen;
		my_iframeButton.value = "Tarifrechner öffnen";
	}
	
	my_iframeOpen = function() {
		my_iframe.height = "3200px";
		my_iframeButton.onclick= my_iframeClose;
		my_iframeButton.value = "Tarifrechner schließen";
	}
	my_iframeClose();
}