// code that produced the problem.
echo $tend //prints 60
echo $total_rec //prints 162
if ($total_rec<$tend)
$tend=$total_rec;

//when the above conditionis reached i have $total_rec=162
//and $tend=60 but this condition turns out to be true
//resulting in all the records being displayed on the 
// same page.the value of $total_rec is assigned to $tend

// fixed code (i am calling this fixing coz its working.)

if ($total_rec<=$tend-1)
echo $tend=$total_rec;

// this condtion works
God Help Me.