function showNextRow(tableName) 
{
    var tbl = document.getElementById(tableName);
    var len = tbl.rows.length;
    var next = false;
    if (len == 1)
        return;
    if (tbl.rows[len-1].style.display != "none") {tbl.rows[0].style.display = "block"; tbl.rows[len-1].style.display = "none";}
    else
    {
        for(i=0 ; i< len; i++)
        {
            if (tbl.rows[i].style.display != "none" && i<len-1) {tbl.rows[i].style.display = "none"; tbl.rows[i+1].style.display = "block"; break;}
        }
    }
} 

function showPreviousRow(tableName) 
{
    var tbl = document.getElementById(tableName);
    var len = tbl.rows.length;
    var next = false;
    if (len == 1)
        return;
    if (tbl.rows[0].style.display != "none") {tbl.rows[len-1].style.display = "block"; tbl.rows[0].style.display = "none";}
    else
    {
        for(i=len-1 ; i > 0 ; i--)
        {
            if (tbl.rows[i].style.display != "none" && i>0) {tbl.rows[i].style.display = "none"; tbl.rows[i-1].style.display = "block"; break;}
        }
    }
} 


function StartTimer(tableName) 
{
    var tbl = document.getElementById(tableName);
    var len = tbl.rows.length;  
    tbl.rows[0].style.display = "block";
	  if (len == 1)
		return;
    for(i=1 ; i< len; i++)
    {
        tbl.rows[i].style.display = "none";
    }
    window.setInterval("showNextRow('"+tableName+"')", 30000);
}