<!--

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 \"Shopping cart\".\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 \"Shopping cart\"-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
//-->