"Document.value" ERROR in IE11

[corei7]

Hi everyone, I'm having issues with thit piece of code:

if (document.bandform.bandmail.value.length==0){ 
		 document.getElementById('bandmaillabel').style.color = "red";
		 document.bandform.bandmail.focus()
      	 return false; 
   	}

This works in all the browsers, except IE11, I've run the debugger in IE11 and I got this: ""Unable to obtain the property 'value', null reference or not defined".

Why? Thanks so much.