function CheckAllIfVisible()
{
	var listCompany = document.getElementById("content");
	for (var i=0; i < listCompany.childNodes.length; i++)
		if (listCompany.childNodes[i].type=='checkbox')
		{
			if(listCompany.childNodes[i].style.display == '')
			{													
				listCompany.childNodes[i].checked = true;
			}
			else
				listCompany.childNodes[i].checked = false;												
		}
}
function ClearAll()
{
var listCompany = document.getElementById("content");
	for (var i=0; i < listCompany.childNodes.length; i++)
	{
		if (listCompany.childNodes[i].type)
		{
			listCompany.childNodes[i].checked = false;			
		}
	}
}