function open_div(str1,str2,str3)
{
	var aa = document.getElementById(str1);
	aa.style.visibility='visible';
	aa.style.overflow='visible';
	aa.style.display='block';
	aa.style.height="";
	
	var bb = document.getElementById(str2);
	bb.style.visibility='hidden';
	bb.style.overflow='hidden';
	bb.style.display='none';
	bb.style.height="0";
	
	var cc = document.getElementById(str3);
	cc.style.visibility='visible';
	cc.style.overflow='visible';
	cc.style.display='block';
	cc.style.height="";
	
}
function hide_div(str1,str2,str3)
{
	var a = document.getElementById(str1);
	a.style.visibility='hidden';
	a.style.overflow='hidden';
	a.style.display='none';
	a.style.height="0";
	
	var b = document.getElementById(str2);
	b.style.visibility='visible';
	b.style.overflow='visible';
	b.style.display='block';
	b.style.height="";
	
	var c = document.getElementById(str3);
	c.style.visibility='hidden';
	c.style.overflow='hidden';
	c.style.display='none';
	c.style.height="0";
}