var but1n = new Image()
but1n.src = "images/but-about-up.gif"
var but1a = new Image()
but1a.src = "images/but-about-down.gif"
var but2n = new Image()
but2n.src = "images/but-projects-up.gif"
var but2a = new Image()
but2a.src = "images/but-projects-down.gif"
var but3n = new Image()
but3n.src = "images/but-gallery-up.gif"
var but3a = new Image()
but3a.src = "images/but-gallery-down.gif"
var but4n = new Image()
but4n.src = "images/but-clients-up.gif"
var but4a = new Image()
but4a.src = "images/but-clients-down.gif"
var but5n = new Image()
but5n.src = "images/but-safety-up.gif"
var but5a = new Image()
but5a.src = "images/but-safety-down.gif"
var but6n = new Image()
but6n.src = "images/but-contact-up.gif"
var but6a = new Image()
but6a.src = "images/but-contact-down.gif"

function act(imgName) {
document[imgName].src = eval(imgName + 'n.src')
}
function inact(imgName) {
document[imgName].src = eval(imgName + 'a.src')
}