var maincontent1 = 3;
var d1 = "url(images/index/VacationBtnA_Hover.gif) no-repeat"; 
var u1 = "url(images/index/VacationBtnA_Link.gif) no-repeat"; 
var d2 = "url(images/index/VacationBtnB_Hover.gif) no-repeat"; 
var u2 = "url(images/index/VacationBtnB_Linkr.gif) no-repeat"; 
var d3 = "url(images/index/VacationBtnC_Hover.gif) no-repeat"; 
var u3 = "url(images/index/VacationBtnC_Link.gif) no-repeat"; 

function Tomaincontent(item) 
{ 
  for (var i=1; i<= maincontent1; i++){
    main_content = document.getElementById("main_content_"+ i); 
	label = document.getElementById("label_"+ i); 
    main_content.style.display = "none"; 
	label.style.background = eval("u"+i); 
  }
    main_content = document.getElementById("main_content_"+ item); 
	label = document.getElementById("label_"+ item); 
    main_content.style.display = "block"; 
	label.style.background = eval("d"+item); 
}