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How to prompt multi line text for user input?

I have this custom button which execute a java script to prompt user for input
var quo = new sforce.SObject("Quote");
quo.Id = '{!Quote.Id}';
var appr_req = 	'{!Quote.List_Price_Change__c}';

if( appr_req == true ){
quo.User_Approval_Comments__c = prompt('Enter your comment','');
quo.User_Submit__c = true;
but this prompt just 1 line of input (i believe this is due to browser). Is there a way to prompt a multi line input for user? Or can I prompt iframe with text area inside for input? Once it saved in the iframe it will refresh the master quote record.