function set_column_heights()
{
var h1 =  document.getElementById("first_column").offsetHeight;
var h2 =  document.getElementById("second_column").offsetHeight;
var h3 =  document.getElementById("third_column").offsetHeight;

var max = get_max(h1,h2,h3);
document.getElementById("first_column").style.height = max;
document.getElementById("second_column").style.height = max;
document.getElementById("third_column").style.height = max;

}

function get_max(a,b,c)
{
if (a>b) 
	{
	if (a>c) return a;
	else return c;
	}
else 
	{
	if (b>c) return b;
	else return c;
	}
}