calling a page from the javascript

All these open in the same window/browser

WITH QUERY STRING
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window.location.href = '/listings/listings_search.asp?strSearch=' + document.getElementById('txtSearch').value;

window.location.href = '/listings/listings_search.asp?strSearch=<%=variablename%>';

WITHOUT QUERY STRING
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window.location.href='forgot_password.asp';

GO TO PREVIOUS PAGE
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window.location.href = '/';