// JavaScript Document
function changeClass(num)
{
for(i=1;i<=9;i++)
{
  t="tr" +i 
 document.getElementById(t).className="text_header"
}
 t="tr" +num 
document.getElementById(t).className="text_header_change"
}
function hideclass(num)
{
	for(i=1;i<=9;i++)
	{
		t="tr" +i 
			document.getElementById(t).className="text_header"
	}
if(num>0)
{
	 t="tr" +num 
	document.getElementById(t).className="text_header_change"
	}
}