use this isNumeric function delete is now enabled also if that focus think worked plz mark that too as answer
function isNumeric(keyCode, value)
{
if(keyCode==16)
isShift =
true;
var
res = ((keyCode >= 48 && keyCode <= 57 || keyCode == 46 || keyCode == 8 || (keyCode >= 96 && keyCode <= 105)) && isShift == false);return res;
}