/*
 * $Id: lib.js,v 1.5 2007/12/17 18:42:10 tcouch Exp $
 *
 * reusable js code.
 */


/*
 * This is not the most efficient/ideal implmentation nor does it have proper
 * list operation semantics... so, a lot of room for improvement.
 *
 * TODO
 * - implement remove(el), removeFirst(el), removeAt(loc)
 */

/**
 * verifies that 'element' is in the array
 */
Array.prototype.contains = function(element){
	for (var i=0; i < this.length; i++ ){
		if ( element == this[i] ){
			return true;
		}
	}
	return false;
}

/**
 * returns the index of the first occurence of element
 */
Array.prototype.indexOf = function(element) {
	for (var i=0; i < this.length; i++ ){
		if ( element == this[i] )
			return i;
	}
	return -1;
}

/**
 * remove the first element encountered.
 *
 */
Array.prototype.remove = function(element) {
	var newArr = new Array();
	var removed = null;

	for ( var i=0; i < this.length; i++ ){
		if ( element != this[i] ) {
			newArr.push(this[i]);
		} else {
			removed = this[i];
		}
	}
	for ( var i=0; i < newArr.length; i++ ) {
		this[i] = newArr[i];
	}
	this.pop();
	return removed;
}

/**
 * Execute 'callback' if the Enter key is pressed
 */
function executeOnEnter(event, callback) {
     if(event.keyCode == 13) {
         callback();
     }
 }
 function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}