Ошибка с перемещением квадрата с использованием мыши

var one = 476;
var two = 476;
var three = 10;
var four = 10;
var help1 = 10;
var lmao = 25;
var lmoa = 450;
flag=false;
function init()
{
document.onmousemove=function dragIt(event)
{
 
if(event.clientY<one && event.clientX <two && event.clientY-13>three && event.clientX-13>four )
{
if(flag)
{
document.all.kv.style.top=event.clientY-lmao;
document.all.kv.style.left=event.clientX-lmao;
}  }
else if(event.clientY>one)
{
sobytie=event;
if(flag)
{
three = three + help1;
one = one + help1;
 
document.all.bigkv.style.top=three;
 
} }
else if(event.clientX>two)
{
sobytie=event;
if(flag)
{
four = four + help1;
two = two + help1;
document.all.bigkv.style.left=four;
document.all.kv.style.top=event.clientY-lmao;
document.all.kv.style.left=event.clientX-lmao;
}
}
else if(event.clientY-13<three)
{
sobytie=event;
if(flag)
{
one = one - help1;
three = three - help1;
document.all.bigkv.style.top=three;
document.all.kv.style.top=event.clientY-lmao;
document.all.kv.style.left=event.clientX-lmao;
} }
else if(event.clientX-13<four)
{
sobytie=event;
if(flag)
{
two = two - help1;
four = four - help1;
document.all.bigkv.style.left=four;
document.all.kv.style.top=event.clientY-lmao;
document.all.kv.style.left=event.clientX-lmao;
} } }
document.all.kv.onmouseup=function osvobodi(){flag=false}
document.all.kv.onmousedown=function zachvat(){flag=true}
}