var nav;
if (document.all) {
	nav= "ie";
}
else{
	if (document.layers){
		nav = "ns";
	}
	else{
		nav = "ns6";
	}
}


function ref(nom_capa)
  {
    if (nav == "ie") return "document.all['" + nom_capa + "'].style.";
    if (nav == "ns") return "document.layers['" + nom_capa + "'].";
    if (nav == "ns6") return "document.getElementById(\"" + nom_capa + "\").style.";
  }

function veure(nom_capa)
  {
    eval(ref(nom_capa) + "visibility = 'visible'");
  }

function amagar(nom_capa)
  {
    eval(ref(nom_capa) + "visibility = 'hidden'");
  }

function mourecapa(capa,posx,posy)
{
        if (nav=="ns") {
                eval("document."+capa+".left=posx;");
                eval("document."+capa+".top=posy;");
        }
        else if (nav=="ns6")
        {
		var myElement = document.getElementById(capa);
		myElement.style.left = posx + "px";
	    myElement.style.top = posy + "px";



        }
		else {
                eval(capa+".style.pixelLeft=posx;");
                eval(capa+".style.pixelTop=posy;");
        }
}

function clipcapa(capa,arr,der,aba,izq)
{
        if (nav=="ns") {
                eval("document."+capa+".clip.top=arr;");
                eval("document."+capa+".clip.right=der;");
                eval("document."+capa+".clip.bottom=aba;");
                eval("document."+capa+".clip.left=izq;");
        }
        else if (nav=="ie"){
                eval(capa+".style.clip='rect("+arr+"px "+der+"px "+aba+"px "+izq+"px)'");
        }
		else 
		{
			var myElement = document.getElementById(capa);
			 valoresclip="rect("+arr+"px "+der+"px "+aba+"px "+izq+"px)";
			
			myElement.style.clip = valoresclip;
			
		
		}
}