<!--

var pk_auswahl = false;
var pk_auswahl_id = 0;

function checkAuswahl(form, element) {		
	if (readAuswahl() != true) {
		if (element.value > 0 && pk_auswahl == false && element.type == "select-one") {		
			pk_auswahl = true;
			pk_auswahl_id = form.pk_id.value;			
		}//end if
			
		for (var i=0; i < document.forms.length; i++) {			
			for (var j=0; j < document.forms[i].elements.length; j++) {
  			if (document.forms[i].elements[j].value > 0 && pk_auswahl_id != form.pk_id.value && document.forms[i].elements[j].type == "select-one" && document.forms[i].elements[j].id == element.id) { 
					alert("In order to select more than one event category, first click onto \"Tickets\".\nThis way, you place the tickets of the relevant category into the shopping basket. \nThen, click onto the \"Back\"-button of your browser, select a different category \nand confirm again with the \"Ticket\"-Button.");
					document.getElementById(element.id).value = 0;		
				}//end if								 
			}//end for			
		}//end for
	} else {		
		pk_auswahl = false;		
		pk_auswahl_id = 0;		
	}//end else	
				
}//end function

function readAuswahl() {
	
check = true;
	
	for (var i=0; i < document.forms.length; i++) {			
		
		for (var j=0; j < document.forms[i].elements.length; j++) {

  		if (document.forms[i].elements[j].value > 0 && document.forms[i].elements[j].type == "select-one") { 
					
				check = false;
					
			}//end if							 
		}//end for						
	}//end for
			
	return check;
	
}//end function

function resetAllForms() {

	for (var i=0; i < document.forms.length; i++) {
	
   		document.forms[i].reset()
		
	}//end for
	
}//end function
//-->