How Do I Change The Background Color Of Gridview Row Based On Key Value Of Selected Row?

protected void GridViewJobList_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
string primaryKey = DataBinder.Eval(e.Row.DataItem, "Entry_No") + "";
string jobNo = DataBinder.Eval(e.Row.DataItem, "Source_ID") + "";
string lineNo = DataBinder.Eval(e.Row.DataItem, "Line_No") + "";
e.Row.Attributes.Add("onclick", "opennewwindow('" + primaryKey + "','" + jobNo + "','" + lineNo + "')");
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='#6699FF'");
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='#F9F7F7'");

//e.Row.Attributes.Add("onclick", "ChangeRowColor(this)");
string primarykey1 = (Request.QueryString["primarykey"]);
//if (e.Row.DataItem, p)
//{
// e.Row.BackColor = System.Drawing.Color.Blue;
//}
if (primarykey1 != null)
{

if (primarykey1 == primaryKey)
{
e.Row.BackColor = System.Drawing.Color.Red;
}

}
}
}


on aspx page
var opennewwindow = function (primarykey ,jobNo,lineNo) {
window.location = "MechanicsJobTime.aspx?primarykey=" + primarykey + "&jobNo=" + jobNo + "&lineNo="+ lineNo;
}

man this works but as user clicks on another row.. key value of that row is taken but that particular row is not highlighted to red.