PNG image to tooltip View

Hi im trying to add a tooltip image to a view column, i have uploaded the web resource .png and tweaked some code of the web as below

is the code alright? i check all the basics such as names and the the view is not an editable grid

function DisplayCustomIcons(row, lcid) {

var tooltip = " ";
var rowStr = JSON.parse(row);
var imageName = "";
var column_data =
rowStr.new_feedback;

if (column_data === "Likely To Renew") {
imageName = "new_FeedbackLikely";
tooltip = "Likely"
}

var result =[imagename, tooltip];
return result;

}

am i missing something? thanks