Opening the webpage as if a link has been clicked from webpage
<p>There is a webpage at this URL:</p>

<p><a href="http://www.vankampen.com/Products/529Portfolios" rel="nofollow">http://www.vankampen.com/Products/529Portfolios</a></p>

<p>This webpage opens with default option "With Sales Charge". There is a link "Without Sales Charge" on this webpage. When we click on this link then webpage displays options related with "Without Sales Charge".</p>

<p>I want to open the "http://www.vankampen.com/Products/529Portfolios" URL with "Without Sales Charge" option instead of default "With Sales Charge" option. </p>

<p>On mouse over of "Without Sales Charge" it shows following function being invoked:
javascript:__doPostBack('ctl00$ctl00$ctl00$m_mainContent$m_secondaryContent$m_mainContent$list529Funds$ctrl1$withoutSalesCharge','')</p>

<p>Can someone suggest me if it is possible to open the webpage with "Without Sales Charge" option  instead of "With Sales Charge" option?</p>

<p>Thanks,</p>
