function loginvalid()
	{
		var username = document.login.userid.value;
		var password = document.login.pwd.value;
		if ((username.length==0) && (password.length==0))
		{
			alert("The username and password textbox is empty");
			document.getElementById("userid").focus();
			return false;
		}
		else if (username.length==0)
		{
			alert("The username textbox is empty");
			document.login.pwd.value="";
			document.getElementById("userid").focus();
			return false;
		}
		 else if (password.length==0)
		 {
		 	alert("The password textbox is empty");
			document.login.userid.value="";
			document.getElementById("userid").focus();
			return false;
			
	     }
		 else
		 {
			 var str=document.login.userid.value;
			 var obj;
			 
			 for(i=0;i<obj.length;i++)
		 	{
			 if((obj.charAt(i)>='a' && obj.charAt(i)<='z')|| (obj.charAt(i)>='A' && obj.charAt(i)<='Z')||(obj.charAt(i)==' ')|| (obj.charAt(i)>='0' && obj.charAt(i)<='9'))
				 {
					
				 }
			 	else
			 	{
					alert("Dont use special character in userid");
					document.login.userid.value="";
					document.login.pwd.value="";
					document.getElementById("userid").focus();
					return false;
				 }
		  }
		 	return true;
		 }
		
	 }