function showTab(objId)
{
	document.getElementById("tab1_content").style.display = "none"
	document.getElementById("tab2_content").style.display = "none"
	document.getElementById("tab3_content").style.display = "none"
	document.getElementById("tab4_content").style.display = "none"
	document.getElementById("tab5_content").style.display = "none"
	document.getElementById(objId).style.display = "block"
}
function changeClass(className)
{
	document.getElementById("tab1_header").className = "tab_off"
	document.getElementById("tab2_header").className = "tab_off"
	document.getElementById("tab3_header").className = "tab_off"
	document.getElementById("tab4_header").className = "tab_off"
	document.getElementById("tab5_header").className = "tab_off"
	document.getElementById(className).className = "tab_on"
}