if(window.addEventListener) { 
window.addEventListener('load',init,false); 
} 
else { 
if(window.attachEvent) { 
window.attachEvent('onload',init); 
} 
} 

function init() { 

test=true; 

obj=document.getElementById('linkdrop'); 
obj1=document.getElementById('tekstdrop'); 

h=obj1.offsetHeight-20; /* 12 represents twice the padding and border width */ 

n=150; 
c=n; 

obj.className=''; 
obj1.style.height=c+'px'; 

obj.onclick=function() { 
if(test==true){ 
num=50; 
expandDiv(); 
test=false; 
obj.firstChild.nodeValue='Review sluiten'; 

} 
else { 
num=-50; 
expandDiv(); 
test=true; 
obj.firstChild.nodeValue='Klik hier voor de volledige review'; 
} 
} 
} 

function expandDiv() { 

if(c>h){ 
c=h; 
clearTimeout(exp); 
test=false; 
return; 
} 

if(c<n){ 
c=n; 
clearTimeout(exp); 
test=true; 
return;} 

c+=num; 

obj1.style.height=c+'px'; 
exp=setTimeout('expandDiv()',10); 
}