jquery live change on input
I am trying to disable next input boxes if first input box is not empty using jquery, please check html and js code...

    <input name = "mrp" id="mrp" type = "text" />
    <input name = "mrp" class="mmw" type = "text" />
    <input name = "mrp" class="mmw" type = "text" />


js code

    $(document).ready(function() {
    		$('#mrp').blur(function() {     //i have even tried with live('change')
    			   var mrp = $(this).val();
    			   if(mrp != '' || mrp != ' '){
    				 $('.mmw').attr("disabled", "disabled");   
    			   }
    			   else if(mrp == '' || mrp == ' '){
    				   $('.mmw').removeAttr("disabled");
    			   }
    			   else{
    				  $('.mmw').removeAttr("disabled");
    			   }
    		});
    });

it disable next input boxes fine but if i make empty first text box then it doesn't remove disable attr.  thanks for help.
jquery live change on input
===

I am trying to disable next input boxes if first input box is not empty using jquery, please check html and js code...

    <input name = "mrp" id="mrp" type = "text" />
    <input name = "mrp" class="mmw" type = "text" />
    <input name = "mrp" class="mmw" type = "text" />


js code

    $(document).ready(function() {
    		$('#mrp').blur(function() {     //i have even tried with live('change')
    			   var mrp = $(this).val();
    			   if(mrp != '' || mrp != ' '){
    				 $('.mmw').attr("disabled", "disabled");   
    			   }
    			   else if(mrp == '' || mrp == ' '){
    				   $('.mmw').removeAttr("disabled");
    			   }
    			   else{
    				  $('.mmw').removeAttr("disabled");
    			   }
    		});
    });

it disable next input boxes fine but if i make empty first text box then it doesn't remove disable attr.  thanks for help.