Edit in JSFiddle

var bkBootstrap = function(){
    
    /**** PUT YOUR PATH HERE ****/
    var  dropboxPath = 'http://dl.dropbox.com/u/52514/bookmarklets/findtext.js';
    /**** DON'T EDIT BELOW HERE ****/
    
    var  head = document.head || document.getElementsByTagName( "head" )[0] || document.documentElement
        ,tag = document.createElement('script');
    
    tag.async = true;
    tag.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.js";
    tag.onload = function(){
        console.log('jquery loaded');
        jQuery.getScript(dropboxPath);
    }
        
    head.insertBefore( tag, head.firstChild );
}
                        
var link = document.getElementById('bk-trigger');
link.href = 'javascript:(' + encodeURIComponent(bkBootstrap.toString()) + ')()'

<a id="bk-trigger" href="">BOOKMARKLET IS GO!</a>