<!--contact validation-->
var testresults
function checkemail(){
var str=document.form1.Email.value
var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str))
testresults=true
else{
alert("Please input a valid email address!")
testresults=false
}
return (testresults)
}
function check_contact()
{
  	
	if( document.form1.FirstName.value == "" )
	{ 
		alert("Please enter your first name");
		document.form1.FirstName.focus()
		return false;
	} 
		if( document.form1.LastName.value == "" )
	{ 
		alert("Please enter your last name");
		document.form1.LastName.focus()
		return false;
	} 
		if( document.form1.Email.value == "" )
	{ 
		alert("Please enter email address ");
		document.form1.Email.focus()
		return false;
	} 

	if( document.form1.Message.value == "" )
	{ 
		alert("Please enter a message/comment ");
		document.form1.Message.focus()
		return false;
	} 
	if( document.form1.code.value == "" )
	{ 
		alert("Please enter verification letters ");
		document.form1.code.focus()
		return false;
	} 
  	return checkemail()		 
}
<!--end-->
<!--login validation-->
function check_login()
{
	if( document.form1.UserName.value == "" )
	{ 
		alert("Please enter UserName ");
		document.form1.UserName.focus()
		return false;
	} 
	if( document.form1.Passwd.value == "" )
	{ 
		alert("Please enter Password ");
		document.form1.Passwd.focus()
		return false;
	} 
	if( document.form1.code.value == "" )
	{ 
		alert("Please enter Verification Letters ");
		document.form1.code.focus()
		return false;
	} 
}
<!--end-->
<!--shirt validation-->
function check_shirtinfo()
{
	if( document.shirt.color.value == "none" )
	{ 
		alert("Please enter a shirt color from the dropdown! ");
		document.shirt.color.focus()
		return false;
	} 
	if( document.shirt.size.value == "none" )
	{ 
		alert("Please enter a shirt size from the dropdown! ");
		document.shirt.size.focus()
		return false;
	} 
}
<!--end-->