// JavaScript Document

onload = function()
{
	var h = 0;
	var l = 0;
	var ht = 0;
   var main = document.getElementById( 'main' );

   if( main.style.offsetHeight )
		h = main.style.offsetHeight;
	else if( main.style.pixelHeight )
		h = main.style.pixelHeight;
   else
		h = main.clientHeight;

   var left = document.getElementById( 'main-left' );

   if( left.style.offsetHeight )
		l = left.style.offsetHeight;
	else if( left.style.pixelHeight )
		l = left.style.pixelHeight;
   else
		l = left.clientHeight;

   var right = document.getElementById( 'main-right' );

   if( right.style.offsetHeight )
		r = right.style.offsetHeight;
	else if( right.style.pixelHeight )
		r = right.style.pixelHeight;
   else
		r = right.clientHeight;
		
	ht = Math.max(l, r, h );
	
	document.getElementById( 'main-left' ).style.height =  ht;
	document.getElementById( 'main-right' ).style.height =  ht;
	document.getElementById( 'main' ).style.height =  ht;

}

function validatePractice()
{
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
   var email_valid = false;
		     
	if ( document.practice.first_name.value=='' )
	{
		alert ( 'Please enter your first name.' );
		practice.first_name.focus();
		return false;
	}

	if ( document.practice.last_name.value=='' )
	{
		alert ( 'Please enter your last name.' );
		practice.last_name.focus();
		return false;
	}

	if (document.practice.email.value=='')
	{
		alert( 'Please enter an email address.');
		practice.email.focus();
		return false;		
	}   
		 
	if (document.practice.email.value.match(emailExp) )
	{
		email_valid = true;
	}
	
	if ( email_valid == false )
	{
		alert( 'Please enter a valid email address.');
		practice.email.focus();
		return false;
	}
}