Esto se logra con un js que me encontré, para llamarlo basta citarlo con la ruta correspondiente (quitar los espacios después del '<'):
< script language="JavaScript" src="./column.js">< /script>
...ahora sí: la función js:
// by Paul@YellowPencil.com and Scott@YellowPencil.com
// feel free to delete all comments except for the above credit
function setTall() {
if (document.getElementById) {
// the divs array contains references to each column's div element.
// Replace 'center' 'right' and 'left' with your own.
// Or remove the last one entirely if you've got 2 columns. Or add another if you've got 4!
var divs = new Array(document.getElementById('contenido'), document.getElementById('enlaces'), document.getElementById('menu'));
// Let's determine the maximum height out of all columns specified
var maxHeight = 0;
for (var i = 0; i < divs.length; i++) {
if (divs[i].offsetHeight > maxHeight) maxHeight = divs[i].offsetHeight;
}
// Let's set all columns to that maximum height
for (var i = 0; i < divs.length; i++) {
divs[i].style.height = maxHeight + 'px';
// Now, if the browser's in standards-compliant mode, the height property
// sets the height excluding padding, so we figure the padding out by subtracting the
// old maxHeight from the new offsetHeight, and compensate! So it works in Safari AND in IE 5.x
if (divs[i].offsetHeight > maxHeight) {
divs[i].style.height = (maxHeight - (divs[i].offsetHeight - maxHeight)) + 'px';
}
}
}
}
window.onload = function() {
setTall();
}
window.onresize = function() {
setTall();
}
