Update or set a parameter in querystring found inside an element attribute (useful for changing the parameters to an <img src="blah?foo=true"> attribute)

gistfile1.coffee

setQueryStringParameter = (element, elementAttr, paramName, paramValue) ->
  src=element.attr elementAttr
  splitSrc=src.split '?'
  uri=splitSrc[0]
  qs=splitSrc[1]
  qsObject={}
  qs.split('&').forEach (attribute) -> 
    split_attr=attribute.split('=')
    qsObject[split_attr[0]]=split_attr[1] 
  console.log qsObject
  qsObject[paramName]=paramValue
  qs=Object.keys(qsObject).map (key) -> key+'='+qsObject[key]
  src=uri+'?'+qs.join('&')
  element.attr elementAttr, src