function searchField()
{
	var str = $("#zoekveld").val();
	if(str == "vul hier uw zoekopdracht in")
	{
		alert("vul uw zoekopdracht in");
	}
	else
	{
		str = str.replace(/ /gi,"_");
		window.location = "/producten/"+str;
	}
}

$(document).ready(function(){
	$("#zoekveld").keydown(function(event) 
	{	
		if (event.keyCode == '13') searchField();
	});
	$("#zoekknop").click(searchField);
});