Interpreting 2 indicators in same window

 
Hi, I am trying to figure out if there is a possibility of interpreting 2 indicators in a same window and carrying out an action. For example, I have added Momentum and RSI on a single window. Both the indicators have there own range in the chart - RSI from 0 to 100 and Momentum from 98 to 101. There are times in the chart when these indicators cross each other. Since these indicators are independent of each other, they do not know the state of the other indicator. If I want to set up an alert when RSI crosses Momentum, is it possible to develop a script to do this?
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