I tried by using this code

q148 is the message text to show

q149 is a validation filed that the lookup will filled if it found something

I used the similar code for validation of a PO number but by usingg a button I created. but for this autofield button that is come by the validation of 2 lookup field and Inside a table field, I cannot make it work

$(document).ready(function () {
   	$('#q148').hide();
  	$('#q149').hide();
 // $('#q125 input').click(function () {
// $('.autofill').click(function () {
  	$('.autofill input').click(function () {        
    	setTimeout(function() {      		 
        	if ($('#q149 input').val()> "0"){         
        		$('#q148').hide();          
        	}
        	else
          	{
          		$('#q148').show();              	              	
      		}
    	}, 300);    
      })
})