}
 else return false;
 }

function objDisplay (obj,on,type) {
 if (on && !type) type = 'block';
 return objSetStyle(obj,'display',(on) ? type:'none');
 }

function dec2hex(n) {
 var s = n.toString(16);
 if (s.length<2) s = '0'+s;
 return s.toUpperCase();
 }
function hex2dec(n) {
 return parseInt(n,16);
 }

function col2Gray(r,g,b) {
 var lum = Math.round( r*0.299 + g*0.587 + b*0.114 );
 return dec2hex(lum)+dec2hex(lum)+dec2hex(lum);
 }

// Color object

function Color(R,G,B,H) {
 this.setRGB(R,G,B,H);