function opacity(id, opacStart, opacEnd, millisec) { 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 

    if(opacStart > opacEnd) { 
        for(i = opacStart; i >= opacEnd; i--) { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        } 
    } else if(opacStart < opacEnd) { 
        for(i = opacStart; i <= opacEnd; i++) 
            { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        } 
    } 
} 

function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}
							
function currentOpac(id, opacEnd, millisec) { 
    var currentOpac = 100; 
							     
    if(document.getElementById(id).style.opacity < 100) { 
        currentOpac = document.getElementById(id).style.opacity * 100; 
    } 

    opacity(id, currentOpac, opacEnd, millisec) 
} 
							
function shiftOpacity(id, millisec) { 
    if(document.getElementById(id).style.opacity == 0) { 
        opacity(id, 0, 100, millisec); 
    } else { 
        opacity(id, 100, 0, millisec); 
    } 
}

function agregar(){
   if ((navigator.appName=="Microsoft Internet Explorer") && (parseInt(navigator.appVersion)>=4)){
      var url="http://www.onicesistemas.es"; 
      var titulo="Onice Sistemas";
      window.external.AddFavorite(url,titulo);
   } else { 
      if(navigator.appName == "Netscape") 
         alert("Presione Crtl+D para agregar este sitio en sus Bookmarks"); 
   }
}