//-- order form bij index pagina: om aantal tickets te verhogen/verlagen
function raiseValue(elem){
	var obj = document.getElementById(elem);
	var objvalue = parseInt(obj.value);
	if(isNaN(objvalue))
	{
		obj.value = '1';
	}
	else
	{
		var objnewvalue = objvalue + 1;
		if (objnewvalue == 100)
		{
			objnewvalue = 99;
		}
		obj.value = objnewvalue + '';
	}
}

function decreaseValue(elem){
	var obj = document.getElementById(elem);
	var objvalue = parseInt(obj.value);
	if(objvalue > 0){
		var objnewvalue = objvalue - 1;
		obj.value = objnewvalue + '';
	}
	else
	{
		obj.value='0';
	}
}


function setVisible(visibleId, hideId){
	$('#' + hideId).css("display", "none");
	$('#' + visibleId).fadeIn('fast');
	
	/*$.ajax({
		type: "POST",
		url: "ajax_changetickets.php",
		data: "what=" + getTickets,
		dataType: "html",
		complete: function(html){
			$("#articles").html(html.responseText);

		}
	});*/
}


//-- order form bij index pagina: hierdoor kan je alleen maar cijfers invullen in aantal velden
function numbersonly(myfield, e, dec)
{
	var key;
	var keychar;

	if (window.event)
	   key = window.event.keyCode;
	else if (e)
	   key = e.which;
	else
	   return true;
	keychar = String.fromCharCode(key);

	// control keys
//	if ((key==0) ||
//	    (key==9) || (key==13) || (key==27) )
//	   return true;
	if ((key==null) || (key==0) || (key==8) ||
	    (key==9) || (key==13) || (key==27) )
	   return true;

	// numbers
	else if ((("0123456789").indexOf(keychar) > -1))
	   return true;

	// decimal point jump
	else if (dec && (keychar == "."))
	   {
	   myfield.form.elements[dec].focus();
	   return false;
	   }
	else
	   return false;
}