problem with onMouseover

hi friends

iam facing one problem from onmouse over,when iam retrieveing data from second time its showing 400 bad request.

i took the data from Temp variable

function OutcomingMsg(RowNo)
{

var OutcomingMsg=document.mform.temp[RowNo].value;
return OutcomingMsg;
}


like this iam takeing
so next time when i click the retrieve button its taking all the temp data

plz solve this issue.

obj.onCellMouseOver= function(event, col, row)
{
var Incoming=IncomingMsg(row);//this.getCellText(12,row);
var Outgoing=OutcomingMsg(row);//this.getCellText (13,row);
a= this.getCellText(col, row);

if(col==7)
document.mform.msg.value="To AMS :\n"+Outgoing;
if(col==8)
document.mform.msg.value="From AMS :\n"+Incoming;
};

function IncomingMsg(RowNo)
{
var IncomingMsg=document.mform.temp2[RowNo].value;
return IncomingMsg;
}
function OutcomingMsg(RowNo)
{
var OutcomingMsg=document.mform.temp[RowNo].value;
return OutcomingMsg;
}


function removedata()
{
alert("clear");
document.mform.msg.value ="";
};

this is not working