function selectExDiv(nr)  {

	var elemClick1 = document.getElementById("click1");
	var elemSee1 = document.getElementById("see1");
	
	var elemClick2 = document.getElementById("click2");
	var elemSee2 = document.getElementById("see2");
	
	var elemClick3 = document.getElementById("click3");
	var elemSee3 = document.getElementById("see3");
	
	
	if(nr == 1) {
			if(elemClick1) elemClick1.className = "active";
			if(elemClick1) elemClick1.style.marginBottom = "0px";			
			if(elemSee1) elemSee1.style.display = "block";
			if(elemClick2) elemClick2.className = "inactive";
			if(elemSee2) elemSee2.style.display = "none";
			if(elemClick2) elemClick2.style.marginBottom = "10px";
			if(elemClick3) elemClick3.className = "inactive";
			if(elemSee3) elemSee3.style.display = "none";		
										
	} else if (nr == 2) {
			
			if(elemClick1) elemClick1.className = "inactive";
			if(elemClick1) elemClick1.style.marginBottom = "10px";		
			if(elemSee1) elemSee1.style.display = "none";
			if(elemClick2) elemClick2.className = "active";
			if(elemClick2) elemClick2.style.marginBottom = "0px";			
			if(elemSee2) elemSee2.style.display = "block";
			if(elemClick3) elemClick3.className = "inactive";
			if(elemSee3) elemSee3.style.display = "none";                                            
	
	} else if (nr == 3)            {
	
			if(elemClick1) elemClick1.className = "inactive";
			if(elemClick1) elemClick1.style.marginBottom = "10px";		
			if(elemSee1) elemSee1.style.display = "none";
			if(elemClick2) elemClick2.className = "inactive";
			if(elemClick2) elemClick2.style.marginBottom = "10px";		
			if(elemSee2) elemSee2.style.display = "none";
			if(elemClick3) elemClick3.className = "active";
			if(elemClick3) elemClick3.style.marginBottom = "0px";				
			if(elemSee3) elemSee3.style.display = "block";
	
	} else {
			alert("invalid div id");
			return false;
	}
	return false;
}