javascript tables

hey guys. i have created a javascript file that stripes rows of my table that i made in html. now i need to edit this javascript so that my columns are now striped and not my rows. wondering if someone could help me out. here is the javascript for striping the rows of my table.

var StripyTables =
{
init: function()
{
var tables = Core.getElementsByClass("dataTable");

for (var i = 0; i < tables.length; i++)
{
var tbodys = tables[i].getElementsByTagName("tbody");

for (var j = 0; j < tbodys.length; j++)
{
var rows = tbodys[j].getElementsByTagName("tr");

for (var k = 1; k < rows.length; k += 2)
{
Core.addClass(rows[k], "alt");
}
}
}
}
};

Core.start(StripyTables);

 Tags: Javascript, Tables

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