var ns = (document.layers) ? 1:0;      
var agent=navigator.userAgent.toLowerCase();
var ns6=(agent.indexOf("gecko")>-1 || window.sidebar)? 1:0;

function declaraDiv(lyr){
		if (ns){
			return document.layers[lyr];			
		}
		else if(ns6){
			return document.getElementById(lyr).style;		
		}
		else{
			return document.all[lyr].style;						
		}	 
}
       
function volcar(id,text) {
                if (ns) {	
                    var lyr = document.layers[id].document;
					lyr.open()
                    lyr.write(text)
                    lyr.close()
                }	
                else if(ns6){
				  	document.getElementById(id).innerHTML = text;
				}
				else document.all[id].innerHTML = text;						
        }


function showDiv(obj) {
                if (ns) obj.visibility = "show"
                else  obj.visibility = "visible"
        }


function hideDiv(obj) {
                if (ns) obj.visibility = "hide"
                else  obj.visibility = "hidden"
        }

function preload(imgObj,imgSrc) {
                if (document.images) {
                        eval(imgObj+' = new Image()')
                        eval(imgObj+'.src = "'+imgSrc+'"')
                }
        }
        
function changeImage(imgName,imgObj) {
                if (document.images) {
						document.images[imgName].src = eval(imgObj+".src")
                }
        }


function changeImage2(layer,imgName,imgObj) {
                if (document.images) {
                       if (document.layers && layer!=null) eval('document.layers.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')					   
                       else document.images[imgName].src = eval(imgObj+".src")
                }
        }
/* 
function moveTo(obj,x,y) {
           obj.xpos = x
           obj.left = obj.xpos
           obj.ypos = y
           obj.top = obj.ypos
}*/

function estils()
{
  if (navigator.appVersion.indexOf('Mac')!=-1)     
        document.write('<link rel="stylesheet" href="estilsmac.css">');
  
  else
     {
  		n = document.layers ? 1:0; 

		if (n) {
		      document.write('<link rel="stylesheet" href="estilsnet.css">');
		}
		else
		      {document.write('<link rel="stylesheet" href="estils.css">');
		}
  }

}


/*   
function moveBy(obj,x,y) {
           obj.xpos += x
           obj.left = obj.xpos
           obj.ypos += y
           obj.top = obj.ypos
}
 
        
function winCenter(win,w,h){
		xW= (screen.width - w)/2;
		yW= (screen.height - h)/2;
		win.moveTo(xW,yW);
	}*/