single quotes escapen

htmlTable.='<tr class="grid<?php if (($rowteller % 2) != "0")     echo ' odd'; ?>" id="stagerow_<?php echo $rowteller; ?>">';

htmlTable.='<tr class="grid<?php if (($rowteller % 2) != "0")     echo ' odd'; ?>" id="stagerow_<?php echo $rowteller; ?>">';

$("#maindiv").html('<?php echo "test"; ?>');

$("#maindiv").html('<?php echo "test"; ?>');

var htmlTable = "<?php $rowteller = 1;";

var htmlTable = "<?php $rowteller = 1;";