innerHTML removes attribute quotes in Internet Explorer

IE innerHTML is very annoying indeed. I wrote this function for it, which may be helpfull? It quotes attributes and sets tagnames to lowercase. By the way, to make it even more annoying, IE’s innerHTML doesn’t remove quotes from non standard attributes.

Edit based on comments
The function now processes more characters in attribute values and optionally converts attribute values to lower case. The function looks even more ugly now ;~). If you want to add or remove characters to the equation, edit the [a-zA-Z\.\:\[\]_\(\)\&\$\%#\@\!0-9]+[?\s+|?>] part of the regular expressions.

function ieInnerHTML(obj, convertToLowerCase) {
    var zz = obj.innerHTML ? String(obj.innerHTML) : obj
       ,z  = zz.match(/(<.+[^>])/g);    

    if (z) {
     for ( var i=0;i<z.length;(i=i+1) ){
      var y
         ,zSaved = z[i]
         ,attrRE = /\=[a-zA-Z\.\:\[\]_\(\)\&\$\%#\@\!0-9\/]+[?\s+|?>]/g
      ;

      z[i] = z[i]
              .replace(/([<|<\/].+?\w+).+[^>]/,
                 function(a){return a.toLowerCase();
               });
      y = z[i].match(attrRE);

      if (y){
        var j   = 0
           ,len = y.length
        while(j<len){
          var replaceRE = 
               /(\=)([a-zA-Z\.\:\[\]_\(\)\&\$\%#\@\!0-9\/]+)?([\s+|?>])/g
             ,replacer  = function(){
                  var args = Array.prototype.slice.call(arguments);
                  return '="'+(convertToLowerCase 
                          ? args[2].toLowerCase() 
                          : args[2])+'"'+args[3];
                };
          z[i] = z[i].replace(y[j],y[j].replace(replaceRE,replacer));
          j+=1;
        }
       }
       zz = zz.replace(zSaved,z[i]);
     }
   }
  return zz;
}

Example key-value pairs that should work

data-mydata=return[somevalue] => data-mydata="return[somevalue]"
id=DEBUGGED:true => id="DEBUGGED:true" (or id="debugged:true" if you use the convertToLowerCase parameter)
someAttribute=Any.Thing.Goes => someAttribute="Any.Thing.Goes"