Image1 = new Image(265,512)
Image1.src = "images/Street-Sign.png"

Image2 = new Image(265,512)
Image2.src = "images/Street-Sign-mark-services.png"

Image3 = new Image(265,512)
Image3.src = "images/Street-Sign-mark-research.png" 

Image4 = new Image(265,512)
Image4.src = "images/Street-Sign-mark-glossary.png"

Image5 = new Image(265,512)
Image5.src = "images/Street-Sign-mark-about.png"

Image6 = new Image(265,512)
Image6.src = "images/Street-Sign-mark-contact.png"

Image7 = new Image(265,512)
Image7.src = "images/Street-Sign-mark-ack.png"



function changeservices() {
document.Map.src = Image2.src; return true;
}

function changeresearch() {
document.Map.src = Image3.src; return true;
}

function changeglossary() {
document.Map.src = Image4.src; return true;
}

function changeabout() {
document.Map.src = Image5.src; return true;
}

function changecontact() {
document.Map.src = Image6.src; return true;
}

function changeack() {
document.Map.src = Image7.src; return true;
}

function original() {
document.Map.src = Image1.src; return true; 
}