diff --git a/lib/zest.js b/lib/zest.js
index f358096..04a2e24 100644
--- a/lib/zest.js
+++ b/lib/zest.js
@@ -171,6 +171,33 @@ var nth = function(param, test, last) {
   };
 };
 
+/**
+ * Handle :column pseudo-classes
+ */
+  function calc_cols (td, cache) {
+    while (td = td.parentNode) if (td.nodeName === 'TABLE') break;
+    
+    var cols = td.getElementsByTagName('col')
+    var col_list = []
+      , col
+      , col_pos = 0
+      , td_pos = 1
+      , spans
+    
+    for (; col = cols[col_pos]; col_pos++) {
+      spans = parseInt(col.getAttribute('span')) || 1
+      
+      td_pos += spans
+      
+      while (spans) {
+        col_list[td_pos - spans] = col
+        spans--
+      }
+    }
+    
+    return col_list
+  }
+
 /**
  * Simple Selectors
  */
@@ -412,14 +439,37 @@ var selectors = {
   ':visited': function() {
     throw new Error(':visited is not supported.');
   },
-  ':column': function() {
-    throw new Error(':column is not supported.');
-  },
-  ':nth-column': function() {
-    throw new Error(':nth-column is not supported.');
+  ':column': function(selector) {
+    var test = zest.compile(selector)
+    
+    return function(el) {
+      if (el.parentNode.nodeType !== 1 || el.nodeName !== 'TD') return;
+  
+      var rel = child(el.parentNode)
+        , pos = 0
+        , temp_pos
+        , cols = calc_cols(el)
+        , spans
+  
+      while (rel) {
+        spans = parseInt(rel.getAttribute('span')) || 1
+        if (rel.nodeName === 'TD') pos += spans
+        if (rel === el) {
+          while (spans--) {
+            temp_pos = pos - spans
+            if (cols[temp_pos] && test(cols[temp_pos])) return true
+          }
+          return false;
+        }
+        rel = next(rel);
+      }
+    };
+  };,
+  ':nth-column': function(param) {
+    return selectors[':column'](':nth-child(' + param + ')')
   },
-  ':nth-last-column': function() {
-    throw new Error(':nth-last-column is not supported.');
+  ':nth-last-column': function(param) {
+    return selectors[':column'](':nth-last-child(' + param + ')')
   },
   ':current': function() {
     throw new Error(':current is not supported.');