function checkform()
{
	if ( document.getElementById('form1').name.value == "" )
	{
		alert ( "Please enter your name." );
		return false;
	}

	if ( document.getElementById('form1').emailaddy.value == "" )
	{
		alert ( "Please enter your email address." );
		return false;
	}

   	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   	var address = document.getElementById('form1').emailaddy.value;
   	if(reg.test(address) == false) 
	{
      alert( "You have entered an invalid email address, please re-enter." );
      return false;
   	}

	if ( document.getElementById('form1').emailsubj.value == "" )
	{
		alert ( "Please enter the subject of your email." );
		return false;
	}

	b = eval("document.getElementById('form1').message.value");
	if ( b.length == 0 )
	{
		alert ( "Message is empty, re-enter your message." );
		return false;
	}

	if ( b.length<20 )
	{
		alert ( "Message seems to be short; if it is short, send an email using your email program." );
		return false;
	}

	document.getElementById('form1').submit();
}