function changeClass (elementID, newClass) {
	var element = document.getElementById(elementID);
	
	element.setAttribute("class", newClass); //For Most Browsers
	element.setAttribute("className", newClass); //For IE; harmless to other browsers.
}


function ocultaMenus(myElem){	
	
	var miArray = new Array("nosotros","servicios","compraventa","galeria","flota","enlaces","contacto"); 
	for (var i = 0; i < miArray.length; i++) {
		if (miArray[i] != myElem || myElem == 'todos'){
			var doc = document.getElementById(miArray[i]);   			
			elem = doc.getElementsByTagName("li");
			for (var j = 0; j < elem.length; j++) {
				if (elem[j]){
					elem[j].style.display="none";
				}	
			}
		}		
	}
	if (myElem != 'todos'){			
		var myImagHover = '../img/menu/'.concat(myElem).concat('Hover').concat('.jpg');	
		document.getElementById('img_'.concat(myElem)).src = myImagHover;
	}
}


function myMenu(myElem){
	
	var myElement = 'img_'.concat(myElem);
	var myImag = '../img/menu/'.concat(myElem).concat('.jpg');	 
	var myImagHover = '../img/menu/'.concat(myElem).concat('Hover').concat('.jpg');	
	
	//primero ocultamos el resto
	var miArray = new Array("nosotros","servicios","compraventa","galeria","flota","enlaces","contacto"); 
	for (var i = 0; i < miArray.length; i++) {
		if (miArray[i] != myElem){
			ocultaMenus(miArray[i]);
			var ocultaImag = 'img_'.concat(miArray[i]);
			var myImag = '../img/menu/'.concat(miArray[i]).concat('.jpg');
			document.getElementById(ocultaImag).src = myImag;
		}
	}	
	
	
	var doc = document.getElementById(myElem);   
	elem = doc.getElementsByTagName("li");
	document.getElementById(myElement).src = myImagHover;
	for (var i = 0; i < elem.length; i++) {   	    
	    if (elem[i].style.display="none"){
			elem[i].style.display="";
		}else {
			document.getElementById(myElement).src = myImag;
			elem[i].style.display="none";
		}
	}  	
}