function showDiv(div1){
	var hza= document.getElementById(div1);		
	hza.style.display = "block";
}


function hideAll(div1){
var divs = document.getElementsByTagName('div');
for (var i = 0; i < divs.length; i++){                      
      var divname = divs[i].id; 
      if(divname.indexOf("study") == 0) { 
		if(divname==div1){
		}else{
			var hza2= document.getElementById(divname);		
			hza2.style.display = "none";
	  }
	}
}
}