function tblShow(tblid)
{   var contentpalcholder = "ctl00_ContentPlaceHolder2_" + tblid;
    var imgPlus1 = document.getElementById("imgplus"+ tblid);
    var imgminus1 = document.getElementById("imgminus"+ tblid);
    if (imgPlus1.style.display != 'none')
    {
	        document.getElementById("imgminus"+ tblid).style.display = 'inline';
	        document.getElementById("imgplus"+ tblid).style.display = 'none';
	        document.getElementById(contentpalcholder).style.display = 'block';
    }
    else if(imgminus1.style.display == 'inline')
    {
	        document.getElementById("imgminus"+ tblid).style.display = 'none';
	        document.getElementById("imgplus"+ tblid).style.display = 'inline';
	        document.getElementById(contentpalcholder).style.display = 'none';
    }
}