Delete char from input using start and end position javascript

I am trying to delete text from input on a following way, and its not working in Mozilla, can anyone help?

In IE its working fine.

var start = txt.selectionStart;
var end = txt.selectionEnd;  
var selectedStr = txt.value.toString().substring(start, end);
txt.value = txt.value.toString().replace(selectedStr, \"\");

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