- arrays as params of functions
- objects as values in arrays
- functions can return objects

- array creation like this: var array = [];
- array.length
- array.indexOf()
- string.split()

- document.getElementById() [ajax_support_getelementbyid]
- element.innerHTML read form DIV [ajax_support_inner_html]
- element.innerHTML write to DIV
- element.innerHTML read form any TAG (SPAN)
- element.innerHTML write to any TAG (SPAN)

- switch(){}
- while(){}
- try{}catch(e){}
- ternary operator (a = b == 1 ? 1 : 0)

- window.setTimeout()
- Math.floor()
- Math.random()

- one of: 
	- XMLHttpRequest()
	- ActiveXObject('Microsoft.XMLHTTP')
	- ActiveXObject('Msxml2.XMLHTTP')
	- ActiveXObject('Msxml2.XMLHTTP.3.0')
	- ActiveXObject('Msxml2.XMLHTTP.4.0')
	- ActiveXObject('Msxml2.XMLHTTP.5.0')
	all of these must support:
	- .setRequestHeader
	- .send
	- .readyState
	- .status
	- .responseText
	- (.onreadystatechange is not used)

optional for debug:
- alert()

WURFL caps
ajax_support_javascript
ajax_support_getelementbyid
ajax_support_xhr
ajax_support_inner_html
ajax_support_full_dom
ajax_manipulate_css