/*
 | Browser object
 */

function ylib_Browser() {
 d=document;
 this.agt=navigator.userAgent.toLowerCase();
 this.major = parseInt(navigator.appVersion);
 this.dom=(d.getElementById)?1:0; // true for ie6, ns6
 this.ns=(d.layers);
 this.ns4up=(this.ns && this.major >=4);
 this.ns6=(this.dom&&navigator.appName=="Netscape");
 this.op=this.agt.indexOf('opera')!=-1;
 this.ie=(d.all);
 this.ie4=(d.all&&!this.dom)?1:0;
 this.ie4up=(this.ie && this.major >= 4);
 this.ie5=(d.all&&this.dom);
 this.win=((this.agt.indexOf("win")!=-1) || (this.agt.indexOf("16bit")!=-1));
 this.mac=(this.agt.indexOf("mac")!=-1);
}

var oBw = new ylib_Browser();

/* ----------------------------------------------------------- 
 | capture key events
 ------------------------------------------------------------- */

var YLIB_SHIFT_KEYCODE = 16;
var YLIB_CTRL_KEYCODE = 17;
var YLIB_ALT_KEYCODE = 18;
var YLIB_SHIFT = "shift";
var YLIB_CTRL = "ctrl";
var YLIB_ALT = "alt";

ylib_keyevt.count=0;
function ylib_keyevt(elm) {
 this.id = "keyevt"+ylib_keyevt.count++;
 eval(this.id + "=this");
 
 this.keys = new Array();
 this.shift=0;
 this.ctrl=0;
 this.alt=0;
 
 this.addKey         = ylib_addKey;
 this.keyevent       = ylib_keyevent;
 this.checkModKeys   = ylib_checkModKeys;
}

// params: 
// cdom - key code for dom browsers, 
// cns4 - key code for ns 4 browser,
// a - action, m - mod key
function ylib_addKey(cdom,cns4,a,m) {
 if (oBw.ie||oBw.dom) { this.keys[cdom] = [a,m]; }
 else { this.keys[cns4] = [a,m]; }
}

var YLIB_COUNT=0;
function ylib_keyevent(evt) {
 if (oBw.ie||oBw.op) evt=event;
 var k = (oBw.ie||oBw.op||oBw.ns6)? evt.keyCode:evt.which;
 this.checkModKeys(evt,k);
 if (this.keys[k]==null) return false;
 var m = this.keys[k][1];
 if ((this.shift && (m.indexOf(YLIB_SHIFT) != -1) || !this.shift && (m.indexOf(YLIB_SHIFT) == -1)) && (this.ctrl && (m.indexOf(YLIB_CTRL) != -1) || !this.ctrl && (m.indexOf(YLIB_CTRL) == -1)) && (this.alt && (m.indexOf("alt") != -1) || !this.alt && (m.indexOf("alt") == -1))) {
  var a = this.keys[k][0];
  a = eval(a); 
  if(typeof a == "function") a();
 }
}

function ylib_checkModKeys(e,k) {
 if (oBw.dom) { 
  this.shift = e.shiftKey;
		this.ctrl = e.ctrlKey;
		this.alt = e.altKey;
 } else {
  // for opera
  this.shift = (k==YLIB_SHIFT_KEYCODE)? 1:0;
		this.ctrl = (k==YLIB_CTRL_KEYCODE)? 1:0;
		this.alt = (k==YLIB_ALT_KEYCODE)? 1:0;
 }
}

var oKey = new ylib_keyevt();