how to call ajax code from an external js file

I use this code to create jquery dialog and CKEditor instance

 <input class="boton_fancybox" onclick="createEditor(this);" id="boton_texto" type="button" style="text-decoration:none;" value="Editar el contenido de este campo">

<textarea rows="5" class="campo" cols="90" id="texto" name="texto" style="display:none;"></textarea>

<script type="text/javascript" src="../../contenidos/ckeditor5/ckeditor.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.0/jquery-ui.min.js"></script>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.0/themes/smoothness/jquery-ui.css" />    
            
<script type="text/javascript">
var editor, html = '';
var config = {};

function createEditor(campo)
{
 var temp = campo.id.split("_");

       if ( editor )
                return;

        $("#div_"+temp[1]).bind('dialogopen', function() //JQ
        {
                editor = CKEDITOR.replace( temp[1],
					{
						height:"600", width:"780",
						toolbar: [
	{ name: 'document', groups: [ 'mode', 'document', 'doctools' ], items: [ 'Source' ] },
	{ name: 'clipboard', groups: [ 'clipboard', 'undo' ], items: [ 'Cut', 'Copy', 'Paste', 'PasteText', 'PasteFromWord', '-', 'Undo', 'Redo' ] },
	'/',
	{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ], items: [ 'Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript', '-', 'RemoveFormat' ] },
	{ name: 'paragraph', groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ], items: [ 'NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'Blockquote' ] },
	{ name: 'links', items: [ 'Link', 'Unlink', 'Anchor' ] },
	{ name: 'insert', items: [ 'HorizontalRule', 'SpecialChar', 'Iframe' ] },
	{ name: 'tools', items: [ 'Maximize' ] },
	 { name: 'colors', items: ['TextColor', 'BGColor'] }


	],
		enterMode : CKEDITOR.ENTER_BR,
						shiftEnterMode: CKEDITOR.ENTER_P
					});
        }).bind('dialogclose', function()
        {
                removeEditor();//CK
                $(this).dialog('destroy');
        })
        .dialog({autoOpen: false,
                maxHeight:0.95 * $(window).height(),//1
                width: 800,
                modal: false,
                position: 'top',
                resizable: false,
                autoResize: true }).dialog('open');
}

function removeEditor()
{
        if ( !editor )
                return;

        editor.destroy();
        editor = null;
}
</script>

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I tried to use createeditor() and removeeditor() in an external js file to use them in other file but they doesnt works.

I there way to use my code in an external js file????