I'm trying to create a button that will move the currently selected OPTION in a SELECT MULTIPLE list to the top of that list. I currently have OptionTransfer.js implemented, which is allowing me to move items up and down the list. I want to add a new function

function MoveOptionTop(obj) { ... } 

Here is the source of OptionTransfer.js

// ===================================================================
// Author: Matt Kruse 
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

/* SOURCE FILE: selectbox.js */
function hasOptions(obj){if(obj!=null && obj.options!=null){return true;}return false;}
function selectUnselectMatchingOptions(obj,regex,which,only){if(window.RegExp){if(which == "select"){var selected1=true;var selected2=false;}else if(which == "unselect"){var selected1=false;var selected2=true;}else{return;}var re = new RegExp(regex);if(!hasOptions(obj)){return;}for(var i=0;i(b.text+"")){return 1;}return 0;});for(var i=0;i3){var regex = arguments[3];if(regex != ""){unSelectMatchingOptions(from,regex);}}if(!hasOptions(from)){return;}for(var i=0;i=0;i--){var o = from.options[i];if(o.selected){from.options[i] = null;}}if((arguments.length=0;i--){if(obj.options[i].selected){if(i !=(obj.options.length-1) && ! obj.options[i+1].selected){swapOptions(obj,i,i+1);obj.options[i+1].selected = true;}}}}
function removeSelectedOptions(from){if(!hasOptions(from)){return;}for(var i=(from.options.length-1);i>=0;i--){var o=from.options[i];if(o.selected){from.options[i] = null;}}from.selectedIndex = -1;}
function removeAllOptions(from){if(!hasOptions(from)){return;}for(var i=(from.options.length-1);i>=0;i--){from.options[i] = null;}from.selectedIndex = -1;}
function addOption(obj,text,value,selected){if(obj!=null && obj.options!=null){obj.options[obj.options.length] = new Option(text, value, false, selected);}}


/* SOURCE FILE: OptionTransfer.js */

function OT_transferLeft(){moveSelectedOptions(this.right,this.left,this.autoSort,this.staticOptionRegex);this.update();}
function OT_transferRight(){moveSelectedOptions(this.left,this.right,this.autoSort,this.staticOptionRegex);this.update();}
function OT_transferAllLeft(){moveAllOptions(this.right,this.left,this.autoSort,this.staticOptionRegex);this.update();}
function OT_transferAllRight(){moveAllOptions(this.left,this.right,this.autoSort,this.staticOptionRegex);this.update();}
function OT_saveRemovedLeftOptions(f){this.removedLeftField = f;}
function OT_saveRemovedRightOptions(f){this.removedRightField = f;}
function OT_saveAddedLeftOptions(f){this.addedLeftField = f;}
function OT_saveAddedRightOptions(f){this.addedRightField = f;}
function OT_saveNewLeftOptions(f){this.newLeftField = f;}
function OT_saveNewRightOptions(f){this.newRightField = f;}
function OT_update(){var removedLeft = new Object();var removedRight = new Object();var addedLeft = new Object();var addedRight = new Object();var newLeft = new Object();var newRight = new Object();for(var i=0;i0){str=str+delimiter;}str=str+val;}return str;}
function OT_setDelimiter(val){this.delimiter=val;}
function OT_setAutoSort(val){this.autoSort=val;}
function OT_setStaticOptionRegex(val){this.staticOptionRegex=val;}
function OT_init(theform){this.form = theform;if(!theform[this.left]){alert("OptionTransfer init(): Left select list does not exist in form!");return false;}if(!theform[this.right]){alert("OptionTransfer init(): Right select list does not exist in form!");return false;}this.left=theform[this.left];this.right=theform[this.right];for(var i=0;i