Simulating Click on a Web Page with Visual C++

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Hello.

I'm trying to simulate a click on a web page using Visual C++. I'm able to extract the contents of the page and get all the elements, but I can't get the click to work when the command (push) button on the web page can have a couple of values. Here's a snippet of my code:

// Set the name and index of the
// command button on the web page.
varID.SetString("DoThis");
varIdx.intVal = 0;

// Get all elements on the web page.
pNewDoc->get_all(&pElemColl);

hr = pElemColl->item(varID, varIdx, &pElemDisp);

if(SUCCEEDED(hr))
{
	hr = pElemDisp->QueryInterface(IID_IHTMLElement, (void**)&pElem);

	if(SUCCEEDED(hr))
	{
		// Obtained element with ID of "DoThis".
		// Here is where I need to assign a Value to DoThis
		// If it helps, in VB, the syntax is just DoThis.Value = 'GetName'
		// After the value is assigned, I want to click the DoThis element.
		pElem->click();
		pElem->Release();
	}
}

I'm sure this is probably simple, put I need some help with it.

Thanks in advance.