function show(nr) {
				var x = 1;
			for (x = 1; x <= 3; x++)
			   {
			   	var hideallProg = "box"+x
					document.getElementById(hideallProg).className ='box hide'
					var changeallLink = "link"+x
					document.getElementById(changeallLink).className =''
			   }
			 var thisID = "box"+nr;
			 document.getElementById(thisID).className ='box show';  
			 var thisLink = "link"+nr;
			 document.getElementById(thisLink).className ='active';  
					if (nr == 1){
					form1.txt1.focus();
					}
					if (nr == 2){
					form2.txt2.focus();
					}
					if (nr == 3){
						form3.txt3.focus();
					}
			}