checking comparision b/w start time & end time

[narinas]

Hello all,
Im validating time between two cell values fromtime(ind==1) and totime(index==2) where time should accept only numbers and ( (totime should be greater than from time)else it should alert an error msg.

[code] myDataProcessor.setVerificator(1,validate_grid);
myDataProcessor.setVerificator(2,validate_grid);
//validation code:

var err_str="";
function validate_grid(value,id,ind)
{
if(ind==1 || ind==2)
{
var patt=/^([0][0-9]|[0-9]|[1][0-9]|[2][0-3])[:]{1}[0-5][0-9]$/;//accepts only numbers & (:)
if(!patt.test(value))
{
mygrid.setCellTextStyle(id,ind,"background-color:yellow;");
if(err_str!="")
err_str+="\n"+(ind+1)+".Enter numbers and (:) only..[ex.05:00 24hr format]";
else
err_str=(ind+1)+".Enter numbers and (:) only..[ex.05:00 24hr format]";
return false;
}
else
{
mygrid.setCellTextStyle(id,ind,"background-color:white;");
return true;
}
}
}[/code]

NOTE:here ind==1 is fromtime and ind==2 is totime .i need to validate time where fromtime should be less than totime and totime should be greater than fromtime,Thank you.