var $ = function(id) {
  return document.getElementById(id);
}

function swapThumb(newSrc) {
  if ($('mimg')) {
    $('mimg').src = newSrc;
  }
}

function toggleTab(index) {
  var title = $('prod-tab-titles');
  if (title) {
    var links = title.getElementsByTagName("A");
	for (var i = 1; i <= links.length; i++) {
      if (i == index) {
	    links[i-1].id = "sel"
	  }
	  else links[i-1].id = "";
	}
	
	for (var i = 1; i <= 3; i++) {	  
	  var content = $('tab' + i);
	  if (content) {
	    content.style.display ='none';  
	  }
	}
	$('tab' + index).style.display = 'block';
  }
}

function emailAFriend(productName) {
  var script = "I thought you might be interested in " + productName + ".\n\nYou can view it at\n" + window.location;
  var subject = encodeURI(productName + " from UK Camera Direct");
  window.location.href = 'mailto:?subject=' + subject + '&body=' + encodeURI(script);
}