function isNumberKey(evt)
{
 var charCode = (evt.which) ? evt.which : event.keyCode
 if (charCode > 31 && (charCode < 48 || charCode > 57))
 {
     alert("Please enter SUS number");
    return false;
}
}


function check_mail()
{
	 var e=document.mail_us;
	 var sus_no = 7;
	 var nonums = /^[0-9]*$/;
	 
	 
	 if(e.u_name.value == 0)
	{
	alert ("Please enter name");
	e.u_name.focus()
	e.u_name.select()
	return false;
	}
	 
	if(e.sus_no.value == 0)
	{
	alert ("Please enter SUS number");
	e.sus_no.focus()
	e.sus_no.select()
	return false;
	}
	 
	if ((e.sus_no.value).length != 7 )
	 {
		alert("SUS number should be  7 numbers!");
		e.sus_no.focus()
		return false;
	 }
 	
	 if(e.unit_location.value == "")
	{
	alert ("Please enter unit location");
	e.unit_location.focus()
	e.unit_location.select()
	return false;
	}
	 
	 
	if(e.f_name.value == "")
	{
	alert ("Please enter your name");
	e.f_name.focus()
	e.f_name.select()
	return false;
	}
	
	if (nonums.test(document.mail.name.value)) 
	{
     alert("Please enter only alphabets");
     e.name.focus()
	 e.name.select()
     return false;
	}
	if(e.pass.value == "")
	{
	alert ("Please enter create password");
	e.pass.focus()
	e.pass.select()
	return false;
	}
	if(e.c_pass.value == "")
	{
	alert ("Please Re-enter password");
	e.c_pass.focus()
	e.c_pass.select()
	return false;
	}
	
	if(e.pass.value != e.c_pass.value)
 	 {
	 alert("The password you entered doesnot match");
 	 e.c_pass.focus()
 	 return false;
	 }
	 
	return true;
}


function check_login()
{
	 var e=document.mail;
	 var sus_no = 7;
	 
	 
	 if(e.sus_no.value == 0)
	{
	alert ("Please enter unit SUS number");
	e.sus_no.focus()
	e.sus_no.select()
	return false;
	}
	  
	 
	if ((e.sus_no.value).length != 7 )
	 {
		alert("Please enter valid SUS number");
		e.sus_no.focus()
		return false;
	 }
 	 
	 
	if(e.pass.value == "")
	{
	alert ("Please enter your password");
	e.pass.focus()
	e.pass.select()
	return false;
	}
	 
	return true;
}

function compose_mail()
{
	 var e=document.compose;
	 var to_susno=7;
	 
	 if(e.to_susno.value == 0)
	{
	alert ("Please enter To SUS number");
	e.to_susno.focus()
	e.to_susno.select()
	return false;
	}
	  
	 
	if ((e.to_susno.value).length != 7 )
	 {
		alert("Please enter valid To SUS number ");
		e.to_susno.focus()
		return false;
	 }
 	 
	if(e.to_sub.value == "")
	{
	alert ("Please enter subject");
	e.to_sub.focus()
	e.to_sub.select()
	return false;
	}
	
	if(e.to_msg.value == "")
	{
	alert ("Please type your message");
	e.to_msg.focus()
	e.to_msg.select()
	return false;
	}
	 
	return true;
}

function password()
{
	 var e=document.change_password;
	 
	 if(e.old.value == "")
	{
	alert ("Please enter old password");
	e.old.focus()
	e.old.select()
	return false;
	}
	 
 	 
	if(e.news.value == 0)
	{
	alert ("Please enter new password");
	e.news.focus()
	e.news.select()
	return false;
	}
	 
	if(e.confirms.value == 0)
	{
	alert ("Please retype new password");
	e.confirms.focus()
	e.confirms.select()
	return false;
	}
	
		
   if (e.news.value != e.confirms.value)
  {
   alert("Passwords does not equal");
   e.confirms.select()
 
   return false;	            
   }
	
	return true;
}