var cat_button1 = 0
var cat_button2 = 0 
var cat_button3 = 0
var cat_button1_down = 0
var cat_button2_down = 0 
var cat_button3_down = 0 
var signup_button = 0
var signup_button_down = 0
var tryitout_button = 0
var tryitout_button_down = 0

function preloadImages()
{
	cat_button1 = new Image()
	cat_button2 = new Image()
	cat_button3 = new Image()
	signup_button = new Image()
	tryitout_button = new Image()
	cat_button1_down = new Image()
	cat_button2_down = new Image()
	cat_button3_down = new Image()
	signup_button_down = new Image()
	tryitout_button_down = new Image()

	cat_button1.src = 'images/dining.jpg'
	cat_button2.src = 'images/ent-and-nightlife.jpg'
	cat_button3.src = 'images/personal-services.jpg'
	signup_button.src = 'images/signupnowbutton.jpg'
	tryitout_button.src = 'images/tryitoutbutton.jpg'
	
	cat_button1_down.src = 'images/dining_down.jpg'
	cat_button2_down.src = 'images/ent-and-nightlife_down.jpg'
	cat_button3_down.src = 'images/personal-services_down.jpg'
	signup_button_down.src = 'images/signupnow_down.jpg'
	tryitout_button_down.src = 'images/tryitout_down.jpg'	
}

function button_on (imgId)
{
  if ( document.images )
  {
    butOn = eval ( imgId + "_down.src" );
    document.getElementById(imgId).src = butOn;
  }
}

function button_off ( imgId )
{
  if ( document.images )
  {
    butOff = eval ( imgId + ".src" );
    document.getElementById(imgId).src = butOff;
  }
}