var but1n = new Image()
but1n.src = "images/but_about_on.gif"
var but1a = new Image()
but1a.src = "images/but_about_off.gif"
var but2n = new Image()
but2n.src = "images/but_solutions_on.gif"
var but2a = new Image()
but2a.src = "images/but_solutions_off.gif"
var but3n = new Image()
but3n.src = "images/but_articles_on.gif"
var but3a = new Image()
but3a.src = "images/but_articles_off.gif"
var but4n = new Image()
but4n.src = "images/but_academy_on.gif"
var but4a = new Image()
but4a.src = "images/but_academy_off.gif"
var but5n = new Image()
but5n.src = "images/but_contact_on.gif"
var but5a = new Image()
but5a.src = "images/but_contact_off.gif"

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

//var but4n = new Image()
//but4n.src = "images/but_seminars_on.gif"
//var but4a = new Image()
//but4a.src = "images/but_seminars_off.gif"