function show(str){
	var mylist = document.getElementById("myList");
// get all list items within the list
    var listItems = mylist.getElementsByTagName("li");
	var firstLI = listItems[listItems.length - 3] ;
    var secondLI = listItems[listItems.length - 2] ;
    var thirdLI = listItems[listItems.length - 1] ;
	if(str == 2){
	 document.getElementById("seo_book").style.display='';
	 document.getElementById("inter_View").style.display='none';
	 document.getElementById("qform").style.display='none';
	 secondLI.className = 'current';
	 firstLI.className = '';
	 thirdLI.className='';
	}

	else if(str == 3){
	 document.getElementById("seo_book").style.display='none';
	 document.getElementById("inter_View").style.display='none';
	 document.getElementById("qform").style.display='';
	 secondLI.className = '';
	 firstLI.className = '';
	 thirdLI.className='current';
	}

	else{
	 document.getElementById("seo_book").style.display='none';
	 document.getElementById("inter_View").style.display='';
	 document.getElementById("qform").style.display='none';
	 secondLI.className = '';
	 firstLI.className = 'current';
	 thirdLI.className='';
	}
}