function validate_email(field,alerttxt)
	{
	with (field)
	{
	apos=value.indexOf("@")
	dotpos=value.lastIndexOf(".")
	if (apos<1||dotpos-apos<2) 
	  {alert(alerttxt);return false}
	else {return true}
	}
	}
 
 function validate_form(thisform)
	{ 
	with (thisform)
	{
	if (validate_required(f_name,"First name must be filled out")==false)
	  {f_name.focus();return false}
	  if (validate_required(l_name,"Last name must be filled out")==false)
	  {l_name.focus();return false}
	  
	  if (validate_email(email,"Please enter a valid email address")==false)
		{email.focus();return false}
		
	}
	
	}
 
 function validate_required(field,alerttxt)
	{
	with (field)
	{
	if (value==null||value=="")
	  {alert(alerttxt);return false}
	else {return true}
	}
	}