Getting the field value one an entity in another entity page...

Hi All,

Suppose we have a Order page like this

James Ande is a contact.

Check  is a button ....So on click of this button ,one alert message should come like "Credit Limit is 1000".

Please any one have the JavaScript code for this type of problem.

 Credit limit is a field in contact page..

So overall ,we are trying to fetch a filed value from one page to a  another page.

If any inputs required tell me.