var subst_1 = new Image (170, 23);
var subst_2 = new Image (170, 23);
var subst_3 = new Image (170, 23);
var subst_4 = new Image (170, 23);


var orig_1  = new Image (170, 23);
var orig_2  = new Image (170, 23);
var orig_3  = new Image (170, 23);
var orig_4  = new Image (170, 23);


subst_1.src = "h2.png";
subst_2.src = "e2.png";
subst_3.src = "d2.png";
subst_4.src = "l2.png";


orig_1.src  = "h1.png";
orig_2.src  = "e1.png";
orig_3.src  = "d1.png";
orig_4.src  = "l1.png";


function canviar (numero)		
			{
			if (numero==1) document.images ["simbol-1"].src = subst_1.src;
			if (numero==2) document.images ["simbol-2"].src = subst_2.src;
			if (numero==3) document.images ["simbol-3"].src = subst_3.src;
			if (numero==4) document.images ["simbol-4"].src = subst_4.src;
			}

function renovar (numero)
			{
			if (numero==1) document.images ["simbol-1"].src=orig_1.src;
			if (numero==2) document.images ["simbol-2"].src=orig_2.src;
			if (numero==3) document.images ["simbol-3"].src=orig_3.src;
			if (numero==4) document.images ["simbol-4"].src=orig_4.src;
			}