gistfile1.txt

var vendors = [ "Webkit", "Moz", "O" ];

function validStyle( prop, value, check_vend ) {
	var div = document.createElement('div'),
		uc = function( txt ) {
			return txt.charAt( 0 ).toUpperCase() + txt.substr( 1 )
		},
		vend_pref = function( vend ) {
			return  "-" + vend.charAt( 0 ).toLowerCase() + vend.substr( 1 ) + "-";
		},
		check_style = function( vend ) {
			var vend_prop = vend_pref( vend ) + prop + ": " + value + ";",
				uc_vend = uc( vend ),
				propStyle = uc_vend + uc( prop );
		
			div.setAttribute( "style", vend_prop );
		
			if( !!div.style[ propStyle ] ) {
				ret = true;
			}
		},
		check_vends = check_vend ? [ check_vend ] : vendors,
		ret;

	for( i = 0; i < check_vends.length; i++ ) {
		check_style( check_vends[i] );
	}
	return !!ret;
}