Smallest getElementsByClassName polyfill (146 chars)

getElementByClassNamePoly.js

//A little bit buggy, but for me it's ok (work wrong if \t (tab) is used inside of className field)
function getElementsByClassPolyfill(className, array, space, index, item){
   index = 0, space = " ", className = space + className + space, array = [];
   while(item = document.all[index++]) {
     if((space + item.className + space).indexOf(className)+1) {
       array.push(item);
     }
   }
   return array;
}


//obfuscated (146 chars)
function getElementsByClassPolyfill(a,b,c,d,e){for(d=0,c=" ",a=c+a+c,b=[];e=document.all[d++];)(c+e.className+c).indexOf(a)+1&&b.push(e);return b}

//usage example
getElementsByClassPolyfill("test");