function changeTab(tab){
	switch (tab) {
		case 1:
			document.getElementById("Tab1").className ="infos_selink";
			document.getElementById("Tab2").className ="infos_link";
			document.getElementById("Tab3").className ="infos_link";
			document.getElementById("Ctab1").style.display='block';
			document.getElementById("Ctab2").style.display='none';
			document.getElementById("Ctab3").style.display='none';
			break
		case 2:
			document.getElementById("Tab1").className ="infos_link";
			document.getElementById("Tab2").className ="infos_selink";
			document.getElementById("Tab3").className ="infos_link";
			document.getElementById("Ctab1").style.display='none';
			document.getElementById("Ctab2").style.display='block';
			document.getElementById("Ctab3").style.display='none';
			break
		case 3:
			document.getElementById("Tab1").className ="infos_link";
			document.getElementById("Tab2").className ="infos_link";
			document.getElementById("Tab3").className ="infos_selink";
			document.getElementById("Ctab1").style.display='none';
			document.getElementById("Ctab2").style.display='none';
			document.getElementById("Ctab3").style.display='block';
			break
	}
}