Sites for total return graph comparisons
Can anyone tell me of a good website that will allow me to overlay total returns graphs for two securities so that I can compare them. I'm looking for data on both ETFs and bond funds, but sites that do one or the other would be welcome. The major graphing sites like google and yahoo only show NAV, which is useless for bond funds.
The best I've found so far is going to vanguard and for a particular fund clicking on Price and Performance tab, then entering anohter fund in "Add a fund" of the "Growth of $10,000" graph. But these are relatively low resolution graphs with limited ability to zoom around and such.