mootool : remove css attribute

Is it not a case of simply removing the line?

or change it to

visibility: visible;

If not I dont understand the question.

#social_wrapper {
      z-index: 10;
      position: absolute;
      top: 27px;
      right: 0;
}

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Add this to your onclick javascript in the element in question:
onclick = "this.style.visibility = 'hidden';"

I Can't help to mention tho, what are you trying to achieve?  visibility still leaves the space there just can't see it.

Most of the time I will use display = none.  This will removed the entire element from the page.  So it would look like this:

onclick = "this.style.display = 'none';"

also if it's not the clicked element you want to go away you'll need to use this:
onclick = "document.getElementById('<element name>').style.display = 'none';"

sorry. suppose the script should use mootool to remove the css attribute.. i have done that in JQuery but unfortunately the site i am wrking on is using mootool...  

bsically i want to hide the div having id =social_wrapper. Onload page it will hide the panel havng id=social_wrapper . when onclik [ in mootool it is click function () ....   ] ....

hope this clarify the question

don;t have time to test on the solutions, therefore accept it as the reference