function precarga(objImg,imgSrc) {
	if (document.images) {
		eval(objImg+' = new Image()');
		eval(objImg+'.src = "'+imgSrc+'"');
	}
}


function cambioImagen(layer,imgName,imgObj,carga) {
	if ((document.images)&&(carga==1)) {
		if (document.layers && layer!=null){
			eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
		}else{								
				eval('document.images["'+imgName+'"].src = '+imgObj+'.src');
				//document.images[imgName].src = eval(imgObj+".src");			
		}
	}
}