if (document.images)	{
 
 // here is where you declare the image objects and preload the images
   
    // create the image object displayed when mouse rolls over the trigger area/link
    // (replace "myButton")    
    ResearchButtonOver= new Image(100,30);
    ResearchButtonOver.src="HeaderRollovers/Above/ResearchOver.gif";  

	// create the image object displayed when mouse rolls off the trigger area
     ResearchButtonOff= new Image(100,30);
     ResearchButtonOff.src="HeaderRollovers/Research.gif";
     
     
     PeopleButtonOver= new Image(78,30);
     PeopleButtonOver.src="HeaderRollovers/Above/PeopleOver.gif";  
     PeopleButtonOff= new Image(78,30);
     PeopleButtonOff.src="HeaderRollovers/People.gif";
     
     PublicationsButtonOver= new Image(112,30);
     PublicationsButtonOver.src="HeaderRollovers/Above/PublicationsOver.gif";  
     PublicationsButtonOff= new Image(112,30);
     PublicationsButtonOff.src="HeaderRollovers/Publications.gif";
     
     IntroButtonOver= new Image(60,30);
     IntroButtonOver.src="HeaderRollovers/Above/IntroOver.gif";  
     IntroButtonOff= new Image(60,30);
     IntroButtonOff.src="HeaderRollovers/Intro.gif";

     ContactButtonOver= new Image(71,20);
     ContactButtonOver.src="HeaderRollovers/Above/ContactOver.gif";  
     ContactButtonOff= new Image(71,20);
     ContactButtonOff.src="HeaderRollovers/Contact.gif";
   
     TeachingButtonOver= new Image(71,20);
     TeachingButtonOver.src="HeaderRollovers/Above/TeachingOver.gif";  
     TeachingButtonOff= new Image(71,20);
     TeachingButtonOff.src="HeaderRollovers/Teaching.gif";
     
     LinksButtonOver= new Image(50,20);
     LinksButtonOver.src="HeaderRollovers/Above/LinksOver.gif";  
     LinksButtonOff= new Image(50,20);
     LinksButtonOff.src="HeaderRollovers/Links.gif";
     
     HomeButtonOver= new Image(50,20);
     HomeButtonOver.src="HeaderRollovers/Above/HomeOver.gif";  
     HomeButtonOff= new Image(50,20);
     HomeButtonOff.src="HeaderRollovers/Home.gif";
     
     FlybrainButtonOver= new Image;
     FlybrainButtonOver.src="HeaderRollovers/Above/FlybrainOver.gif";  
     FlybrainButtonOff= new Image;
     FlybrainButtonOff.src="HeaderRollovers/Flybrain.gif";
     }

// create the functions that will swap the rollover images
function rollOver(imgName)	{
	if (document.images)	{
		imgOver=eval(imgName + "Over.src");
		document[imgName].src= imgOver;
	}
}

function rollBack(imgName)	{
	if (document.images)	{
		imgOff=eval(imgName + "Off.src");
		document[imgName].src= imgOff;
	}
}