I have the code bellow and for some reason I have a infinite loop, but I just can't find it to fix it. I just call the function move to dynamicly resize a DIV.

var pos;
var finalPosition;
var myTimer;
var myVar;
var cnt;

function move(finalSize){
cnt=document.getElementById('contentBorder');
pos = cnt.clientHeight;
myVar = cnt.clientHeight;
finalPosition = finalSize;
resize_element(finalPosition);
}

function resize_element(size) {
if (myVar < size){
myTimer=setInterval("increaseBorder()",100);
} else if (myVar > size) {
myTimer=setInterval("decreaseBorder()",100);
} else if (myVar == size) {
} else {
alert('error from: ' + myVar + ' to: ' + size);
}
}

function increaseBorder(){
pos++;

if( pos < finalPosition ){
cnt.style.height = pos + 'px';
} else if(pos >= finalPosition){
clearInterval(myTimer);
} else {
clearInterval(myTimer);
alert('error increase');
}
}

function decreaseBorder(){
pos--;
if( pos > finalPosition ){
cnt.style.height = pos + 'px';
} else if(pos <= finalPosition){
clearInterval(myTimer);
} else {
clearInterval(myTimer);
alert('error increase');
}
}