function tab1(nr){

	for (i = 1; i < 4; i++)
	{
			if (nr == i)
			{
				document.getElementById("tab1_" + i).className = ("t" + i + "_on");
				document.getElementById("tab1_content" + i).style.display = "";
			}
			else
			{
				document.getElementById("tab1_" + i).className = ("t" + i);
				document.getElementById("tab1_content" + i).style.display = "none";
			}
 }

}


function tab2(nr){

	for (i = 1; i < 5; i++)
	{
			if (nr == i)
			{
				document.getElementById("tab2_" + i).className =  ("t" + i + "_on");
				document.getElementById("tab2_content" + i).style.display = "";
			}
			else
			{
				document.getElementById("tab2_" + i).className = ("t" + i);
				document.getElementById("tab2_content" + i).style.display = "none";
			}
 }

}

var tabs2_active_tab = 1;