function showFSRC() {
	fsrc1 = document.getElementById("fsrc");
	if(fsrc1.style.display == "block"){
		fsrc1.style.display = "none";
		document.images.imgfsrc.src = "../img/1px/arrow_down.gif";
		document.images.imgfsrc.alt = "Mehr Informationen zur Quelle";
	} else {
		fsrc1.style.display = "block";
		document.images.imgfsrc.src = "../img/1px/arrow_up.gif";
		document.images.imgfsrc.alt = "Weniger Informationen zur Quelle";
	}
}