Localize some variables that where accidentally global. Resolves issue #1806.

Author: dpvc

unpacked/jax/output/CommonHTML/autoload/mtable.js

@@ -220,7 +220,7 @@ MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function () {
         for (var j = 0, M = row.length; j < M; j++) {
           var s = (rdata.type === "mtr" ? 0 : LABEL);
           var mtd = rdata.data[j-s] || {CHTML: CHTML.BBOX.zero()};
-          cell = row[j].style; cbox = mtd.CHTML;
+          var cell = row[j].style; cbox = mtd.CHTML;
           //
           //  Space and borders between columns
           //

unpacked/jax/output/CommonHTML/jax.js

@@ -394,7 +394,7 @@
 
     preTranslate: function (state) {
       var scripts = state.jax[this.id], i, m = scripts.length,
-          script, prev, node, test, span, jax, ex, em;
+          script, prev, node, test, span, jax, ex, em, scale;
       //
       //  Get linebreaking information
       //
@@ -1326,7 +1326,7 @@
       if (scale*cbox.b - y > this.b) this.b = scale*cbox.b - y;
     },
     append: function (cbox) {
-      scale = cbox.rscale; var x = this.w;
+      var scale = cbox.rscale; var x = this.w;
       if (x + scale*cbox.r > this.r) this.r = x + scale*cbox.r;
       if (x + scale*cbox.l < this.l) this.l = x + scale*cbox.l;
       this.w += scale*(cbox.w+(cbox.L||0)+(cbox.R||0)) ;