// JavaScript Document
function validate_login()
{
	var msg='';
	var flag=true;		
	var username=document.loginForm.username.value;
	var userpassword=document.loginForm.userpassword.value;	
	username=trim_it(username);
	if( username.length == 0 )
	{
		msg+="Please enter username.\n";
		flag=false;
	}
	else
	{
		if( ! IsValidUserName_ch(username) )
		{
			msg+="Please enter correct username.\n";
			flag=false;
		}
	}
	userpassword=trim_it(userpassword);
	if( userpassword.length == 0 )
	{
		msg+="Please enter Password.\n";
		flag=false;
	}
	if( flag == false )
	{
		alert(msg);
	}
	return flag;
}

function IsValidUserName_ch(p)
{
	for(var i = 0; i < p.length; i++)  
	{ 
      var c = p.charAt(i);
      if ((c == ' ') || (c == '\n') || (c == '\t'))
      {          
          return false;
    }
  }
  return true;
}

function trim_it(str)
{
   return str.replace(/^\s*|\s*$/g,"");
}