Quotes, inside quotes, inside quotes in javascript

Quotes, inside quotes, inside quotes in javascript

I try to put \ before quotes, change double for single quotes... but
nothing. Everyone have a solution or tip? Thanks!
This is the code:
html.append('<li lat="'+dataRaw[key].optionsDir['gpsLatitude']+'"
lon="test">'+thumbnailHtml+descriptionHtml+'</li>');