JavaScript (In)Compatibility
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atan2  NS2   
Math.atan2(x,y)  
Returns the angle in radians from the X axis to a point.  
back  NS2   
history.back()  
Loads the previous URL in the history list.  
bgColor  NS2   
document.bgColor  
A string specifying the color of the document background.  
big  NS2   
stringName.big()  
Causes a string to be displayed in a big font as if it were  
in a <BIG> tag.  
blink  NS2 NS3
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