ActionScript 3.0 :: Loading Multiple Images To Multiple Loaders With A Loop?

i have been building a library that has thumbnails which you click to view the full image. i have built the application it works but i want to change the way the image on the actual thumbnail loads using code instead of manually adding the value to the url loader component.

var myX;var instanceN:String;trace(instanceN);var currentLoad:uint = 0;// current loader and image loadingvar thumbnailURL:String;//Thumbnail URLvar thumbReq:URLRequest;// Thumbnail url requestfor(var k:uint = 0;k < iL_btn.length; k++)[code].....

the loop runs fine without the last line of code which i've commented out.the make up of these thumbnails are a uiLoader component which are each inside there own movieClip.what i wanted this to do was every time the loop runs it currentLoad adds 1 to its value then that value is subbed into instanceN:String and thumbnailURL address that bit works the trace statements read correctly.but my issue is using the instanceN value as the instance name path which then loads the current thumbnailURL value which is the URL address for the thumbnail picture.when i try to load the url address using the commented out code above i got the error .TypeError: Error #1010: A term is undefined and has no properties.the trace statements correct values below

the first value is the currentLoad value.

the second value is the instance name path.

the third is is the URL address for the thumbnail.[code].....