function showHide(str1, str2, str3, str4)
		{
		    var obj1 = document.getElementById(str1);
		    var obj2 = document.getElementById(str2);
		    var obj3 = document.getElementById(str3);
		    var obj4 = document.getElementById(str4);
		    obj1.style.display ='inline';
		    obj2.style.display ='none';
		    obj3.className = 'selected';
		    obj4.className = 'light';
		}