[jQuery] jQuery selectors with reference to object

[tronen]

Hi, I am new to jQuery and is curious if this code can be shortened
down? It feels like it can, but I couldn't find any way to use jQuery
selectors if I have a specific reference to a object.

What I want to do is to find the element to the parent of "el" that
the id starts with linecolorbox. I know how to do it if I want to find
ALL the ones that id start with linecolorbox,  but not if I want to
start with a specific element as reference (el.parentNode).

                jQ('.linecolor').each(
                        function() {
                                try {
                                        var el = this;
                                        if(el.value.match(/^f{6}$/i)) {
                                                el.value = '';
                                        }
                                        var nodes = el.parentNode.childNodes;
                                        for(var i=0; i<nodes.length; i++) {
                                                for(var j=0; 
j<nodes[i].childNodes.length; j++) {
                                                        
if(nodes[i].childNodes[j].id) {
                                                                
if(nodes[i].childNodes[j].id.match(/^linecolorbox/)) {
                                                                        var 
colorbox = nodes[i].childNodes[j];
                                                                        
if(el.value.match(/^[0-9a-f]{6}$/i)) {
                                                                                
colorbox.innerHTML = '&nbsp;&nbsp;&nbsp;&nbsp;';
                                                                        } else {
                                                                                
colorbox.innerHTML = '&nbsp;X&nbsp;';
                                                                        }
                                                                }
                                                        }
                                                }
                                        }
                                } catch(e) {
                                        alert(e.message);
                                }
                        }
                );