if(document.images){
var welcomeButton = new Image();
welcomeButton.src ="images/B_WELCOME2.GIF";
var aboutButton = new Image();
aboutButton.src ="images/B_ABOUT2.GIF";
var servicesButton = new Image();
servicesButton.src ="images/B_SERVICES2.GIF";
var contactButton = new Image();
contactButton.src ="images/B_CONTACT2.GIF";
};

function overWelcome(){
if(document.images){document.images["welcome"].src = welcomeButton.src};
};

function offWelcome(){
if(document.images){document.images["welcome"].src = "images/B_WELCOME1.GIF"};
};

function overAbout(){
if(document.images){document.images["about"].src = aboutButton.src};
};

function offAbout(){
if(document.images){document.images["about"].src = "images/B_ABOUT1.GIF"};
};

function overServices(){
if(document.images){document.images["services"].src = servicesButton.src};
};

function offServices(){
if(document.images){document.images["services"].src = "images/B_SERVICES1.GIF"};
};

function overContact(){
if(document.images){document.images["contact"].src = contactButton.src};
};

function offContact(){
if(document.images){document.images["contact"].src = "images/B_CONTACT1.GIF"};
};