/*
  Cross browser utility functions.
*/

// gets an object given it's id value
function getById(objId) {
  var myObj;
  if (document.all && !document.getElementById) {
    myObj = eval('document.all.' + objId);
  }
  else if (document.layers) {
    myObj = eval('document.' + objId);
  }
  else if (document.getElementById) {
    myObj = document.getElementById(objId);
  }
  return myObj;
}

// gets the x coordinates for event e
function getX(e) {
  if (e.pageX || e.pageY) {
    return e.pageX;
  }
  else if (e.clientX || e.clientY) {
    if (document.body.scrollLeft) {
      return e.clientX + document.body.scrollLeft;
    }
    else {
      return e.clientX;
    }
  }
}

// gets the y coordinates for event e
function getY(e) {
 if (e.pageX || e.pageY) {
    return e.pageY;
  }
  else if (e.clientX || e.clientY) {
    if (document.body.scrollTop) {
      return e.clientY + document.body.scrollTop;
    }
    else {
      return e.clientY;
    }
  }
}

// gets target for event e
function getTarget(e) {
  var targ;
 if (!e)  e = window.event;
 if (e.target) targ = e.target;
 else if (e.srcElement) targ = e.srcElement;
 if (targ.nodeType == 3) // defeat Safari bug
    targ = targ.parentNode;
 return targ;
}
// returns the frame height
function getHeight() {
    var height;
    if (self.innerHeight) {
      height = self.innerHeight;
    }
    else if (document.documentElement && document.documentElement.clientHeight) {
        height = document.documentElement.clientHeight;
    }
    else if (document.body) {
        height = document.body.clientHeight;
    }
    else {
        // don't know height
        height = 0;
    }
    return height;
}

// returns the frame width
function getWidth() {
    var width;
    if (self.innerWidth) {
      width = self.innerWidth;
    }
    else if (document.documentElement && document.documentElement.clientWidth) {
        width = document.documentElement.clientWidth;
    }
    else if (document.body) {
        width = document.body.clientWidth;
    }
    else {
        // don't know width
        width = 0;
    }
    return width;
}

function getScrollX() {
  var x;
  if (self.pageXOffset) // all except Explorer
  {
	x = self.pageXOffset;
  }
  else if (document.documentElement && document.documentElement.scrollTop)
	// Explorer 6 Strict
  {
	x = document.documentElement.scrollLeft;
  }
  else if (document.body) // all other Explorers
  {
	x = document.body.scrollLeft;
  }
  return x;
}

function getScrollY() {
  var y;
  if (self.pageYOffset) // all except Explorer
  {
        y = self.pageYOffset;
  }
  else if (document.documentElement && document.documentElement.scrollTop)
        // Explorer 6 Strict
  {
        y = document.documentElement.scrollTop;
  }
  else if (document.body) // all other Explorers
  {
        y = document.body.scrollTop;
  }
  return y;
}


// determines if the given string is a single digit
function isDigit(num) {
  if (!num) {
   return false;
  }
  for (var i=0;i<num.length;i++) {  
    var string="1234567890";
    if (string.indexOf(num.substring(i,i+1))==-1){return false;}
  }
  return true;
}

function isSafari() {
  var is_konq = (navigator.vendor == 'KDE')||(document.childNodes)&&(!document.all)&&(!navigator.taintEnabled)?true:false;
 return is_konq;
}

/*
   name - name of the cookie
   value - value of the cookie
   [expires] - expiration date of the cookie
     (defaults to end of current session)
   [path] - path for which the cookie is valid
     (defaults to path of calling document)
   [domain] - domain for which the cookie is valid
     (defaults to domain of calling document)
   [secure] - Boolean value indicating if the cookie transmission requires
     a secure transmission
   * an argument defaults when it is assigned null as a placeholder
   * a null placeholder is not required for trailing omitted arguments
*/

function setCookie(name, value, expires, path, domain, secure) {
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toGMTString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}


/*
  name - name of the desired cookie
  return string containing value of specified cookie or null
  if cookie does not exist
*/

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

/*
   name - name of the cookie
   [path] - path of the cookie (must be same as path used to create cookie)
   [domain] - domain of the cookie (must be same as domain used to
     create cookie)
   path and domain default if assigned null or omitted if no explicit
     argument proceeds
*/

function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

// date - any instance of the Date object
// * hand all instances of the Date object to this function for "repairs"

function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}