function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		buttonmachines_over = newImage("images/bomachines.gif");
		buttonmaterials_over = newImage("images/bomaterials.gif");
		buttonsoftware_over = newImage("images/bosoftware.gif");
		buttonservice_over = newImage("images/boservice.gif");
		buttonteach_over = newImage("images/boteach-over.gif");
		buttongallery_over = newImage("images/bogallery.gif");
		buttoncontacts_over = newImage("images/bocontacts.gif");
		preloadFlag = true;
	}
}
		
function machinesMenu(show)
{
	if(show == true){
		softMenu(false);
		document.getElementById('menu').style.visibility = 'visible';
	}else{
		document.getElementById('menu').style.visibility = 'hidden';
	}
}

function softMenu(show)
{
	machinesMenu(false);
	if(show == true){
		var m = document.getElementById('smenu');
		m.style.left = '490px';
		m.style.visibility = 'visible';
	}else{
		document.getElementById('smenu').style.visibility = 'hidden';
	}
}

function isIE6()
{
	var sBrowserName = navigator.userAgent;
	return (sBrowserName.indexOf('MSIE 6.0') != -1) ? true : false;
}