// JavaScript Document
function isNumberKey(evt)
{
   var charCode = (evt.which) ? evt.which : event.keyCode
   if (charCode > 31 && (charCode < 48 || charCode > 57))
      return false;

      return true;
}

function changeClassHover(id, action) {
	el=document.getElementById(id);
	el.className=id+'_'+action;
}

function showAns(id) {
	el=document.getElementById(id);
	style_value=el.style.display;
	if (style_value == 'block') {el.style.display='none';} else {el.style.display='block';}
}

function openSmallWindow(page) {
	window.open(page,'smallWindow',
    "height=500,width=430,status=yes,toolbar=no,menubar=no,location=no,scrollbars=yes");
}

function showCountry(id, id2) {
	el= document.getElementById(id);
	el2=document.getElementById(id2);
	if (el.value == 'Netherlands') {
		el2.style.display="none";
	} else {
		el2.style.display="";
	}
}