function calcHeight(elem)
{
	//find the height of the internal page
	var the_height=500;
	var padding=30;//to avoid the scroll bar
	try
	{
		if( elem.contentWindow && elem.contentWindow.document)
		{
			the_height=elem.contentWindow.document.body.scrollHeight;
		}
	}
	catch(e){}
	//change the height of the iframe
	elem.height=the_height +padding;
}