1. Open up IDM (internet download manager) and click options button
2. Click site logins button
3. Click new to add your rapidshare premium account like picture below :
4. Make sure that you add http, rapidshare.com and your user and password for your premium account.
5. And click ok. Try to highlight some rapidshare link and click download with idm to test it.

What is the best features for rapidshare premium :

• maximum file size for uploads
• Up to 500 gb personal webspace
• Inclusive download traffic up to 80 GB permonth
• No deletion files (if free account file will delete after 90 days no download)
• Unlimited download speed and max parallel download
• Can resume your broken while downloading files

format_num=function(input){
var num = input.value.replace(/\,/g,”);
if(!isNaN(num)){
if(num.indexOf(’.') > -1){
num = num.split(’.');
num[0] = num[0].toString().split(”).reverse().join(”).replace(/(?=\d*\.?)(\d{3})/g,’$1,’).split(”).reverse().join(”).replace(/^[\,]/,”);
if(num[1].length > 2){
alert(’Maksimum 2 Desimal !!!’);
num[1] = num[1].substring(0,num[1].length-1);
}  input.value = num[0]+’.'+num[1];
} else{ input.value = num.toString().split(”).reverse().join(”).replace(/(?=\d*\.?)(\d{3})/g,’$1,’).split(”).reverse().join(”).replace(/^[\,]/,”) };
}
else{ alert(’Input Harus Numerik !!!’);
input.value = input.value.substring(0,input.value.length-1);
}
};