var ROOTURL="http://www.accurateav.co.uk/";

function roll_over(image_id,change_to) {
   var this_img=document.getElementById(image_id);
   this_img.src=ROOTURL+change_to;
}
function post_form($form_id){document.getElementById($form_id).submit();}
function add_event($object,$type,$fn){ 
   if($object.attachEvent){ 
      $object['e'+$type+$fn] = $fn; 
      $object[$type+$fn] = function(){$object['e'+$type+$fn]( window.event );} 
      $object.attachEvent( 'on'+$type, $object[$type+$fn] ); 
   }else{
      $object.addEventListener($type,$fn,false); 
   }
}
function remove_event($object,$type,$fn){
   if($object.detachEvent){
      $object.detachEvent('on'+$type,$object[$type+$fn]);
      $object[$type+$fn]=null;
   }else{
      $object.removeEventListener($type,$fn,false);
   }
} 
function elements_with_class($elem,$tag_name,$class_name){
   var $arr_elems=($tag_name=="*" && document.all)? document.all : $elem.getElementsByTagName($tag_name);
   var $found = new Array();
   for($i=0;$i<$arr_elems.length;$i++){  
      if($arr_elems[$i].className==$class_name) $found.push($arr_elems[$i]);
   }
   return ($found);
}
function http_location($filename){
   window.location=$filename;
}
function confirm_action($message,$url) {
	var $answer=confirm($message);
	if($answer)window.location($url);
}
function picture_window($url,$width,$height,$window) {
   window.open($url+'&width='+$width+'&height='+$height,$window,"width="+$width+",height="+$height+",scrollbars=no,left=100,top=100");
}
function external_links(){
   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";
   }
}

function show_categories($num,$is_sub){
   $elem=document.getElementById('productmenu'+$num);
   $button=document.getElementById('productmenubutton'+$num);
	 if($elem.style.display=='none' || !$elem.style.display){
	    $elem.style.display='block';
			$button.style.fontWeight='bold';
			if(!$is_sub){
			   $button.style.backgroundImage='url(img/product_button_on.gif)';
				 $button.style.color='#FFFFFF';
      }
	 }else{
	    $elem.style.display='none';
			$button.style.fontWeight='normal';
			if(!$is_sub){
			   $button.style.backgroundImage='url(img/product_button_off.gif)';
				 $button.style.color='#666666';
      }
	 }
}

function image_rotate(){
   setTimeout('swap_image(2)',5000);
}

function swap_image($onfront){
	 $elem=document.getElementById('frontpanel').style.backgroundImage='url('+ROOTURL+'img/front'+$onfront+'.jpg)';
	 if($onfront==3){ $onfront=1; }else{ $onfront++; }
   setTimeout('swap_image('+$onfront+')',5000);
}

function preload_buttons(){
   external_links();
	 //image_rotate();
   $pic1=new Image(186,44);$pic1.src=ROOTURL+'img/button_corporate_on.gif';
   $pic2=new Image(186,44);$pic2.src=ROOTURL+'img/button_education_on.gif';
   $front2=new Image(625,539);$pic2.src=ROOTURL+'img/front2.jpg';
   $front3=new Image(625,539);$pic2.src=ROOTURL+'img/front3.jpg';
}
window.onload=preload_buttons;