var maincontent1 = 3;
var d1_1 = "url(images/productsnot.jpg) no-repeat"; 
var u1_1 = "url(images/productsin.jpg) no-repeat"; 
var d1_2 = "url(images/solutionsnot.jpg) no-repeat"; 
var u1_2 = "url(images/solutionsin.jpg) no-repeat"; 
var d1_3 = "url(images/Servicenot.jpg) no-repeat"; 
var u1_3 = "url(images/Servicein.jpg) 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("d1_"+i); 
  }
    main_content = document.getElementById("main_content_"+ item); 
	label = document.getElementById("label_"+ item); 
    main_content.style.display = "block"; 
	label.style.background = eval("u1_"+item); 
}