how can i send event object with php string?

[reazrana]

$tree_string .= "<tr class='td-data-blank'><td idth= 40 ></td><td  idth= '100%' id='s_$subroute_id' align='left' onclick='clickOnElement(event)'  class=bsmall style='color:#ffffff;cursor:pointer'>$subroute_name</td></tr>"; 

i want to send event object in clickOnElement(). how can I??

[boogyman]

$tree_string .= "<tr class='td-data-blank'><td idth= 40 ></td><td  idth= '100%' id='s_$subroute_id' align='left' onclick='clickOnElement(this)'  class=bsmall style='color:#ffffff;cursor:pointer'>$subroute_name</td></tr>";