function changeClass(obj, new_class)
{
    obj.className = new_class;
}

function changeBgColor(obj, new_color)
{
	obj.style.backgroundColor=new_color;
}

function changePic(name, pic)
{
	name.src = pic;
}

function orderChange(values, courseIds, datesIds) {
  document.forms[1].course_select_date.options.length = 0;

  var count = 0;
  for(i=0;i<courseIds.length;i++) {
    if ((courseIds[i] == document.forms[1].course_wanted.options[document.forms[1].course_wanted.selectedIndex].value) || (courseIds[i] == 0)) {
      document.forms[1].course_select_date.options[count] = new Option(values[i], datesIds[i]);
      count++;
    }
  }

}

function popup(url, name, width, height, scrollbars)
{
	left_pos = (screen.width / 2) - (width / 2);
	top_pos = (screen.height / 2) - (height / 2);

	window.open(url, name, 'resizable=1,scrollbars='+scrollbars+',status=no,toolbar=no,menubar=no,width=' + width + ',height=' + height + ',left=' + left_pos + ',top=' + top_pos);	
	return false;
}

function externalLinks()
{
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++)
	{
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
			anchor.target = "_blank";
	}
}
window.onload = externalLinks;

function emptyfield (field, defaultval, blur)
{
	
	if ( blur == true ) {
	
		if (field.value == '') {
			field.value = defaultval;
		}
	
	} else {
	
		if (field.value == defaultval) {
			field.value = '';
		}
	
	}
		
	return true;
}