not: function( old ){ if( typeof old == 'object' ) { old = old.elements || old, cur = this.elements; var temp = [], a = [], k = -1, el, key, c = 0; while( el = old[++k] ){ key = el.tagName + el.id + el.className + el.name + el.style; if (temp[key]) { temp[key]++; } else { temp[key] = 1; } } k = -1; while( el = cur[++k] ){ key = el.tagName + el.id + el.className + el.name + el.style; if (temp[key]) { if (temp[key] == 0) { return false; } else { temp[key]--; } } else a[c++] = el; } } return this.sync(a); }