Getting all properties of javascript object

[computerzworld]

Hello,
I want to grab all properties of javascript object. Lets say I am having an object of textbox,span,div,link etc. in document.getElementById('elementId'). And I want to grab all the properties of this object like its attributes and values. How can I get these values? Please help me. Thanks in advance.

[Weedpacket]

for(propertyname in theobject)
{.....theobject[propertyname].....}