javascript - jQuery Random Item from Array Not Working -

i trying assign random background color reach td. have array:

var randomcolor = ["red","blue","green","mint","yellow","lightpurple"]; 

and function:

function setrandomcolor(){     return randomcolor[math.floor(math.random() * randomcolor.length)];   } 

here jsfiddle:

http://jsfiddle.net/2j8yq/16/

you'll notice every 2-3 times run program, td cell random white. know why is? not have white in array option. not sure why td cell's generating white background.

any appreciated!

thanks

lightpurple , mint not valid color keywords. error such

expected color found 'mint'. error in parsing value 'background-color'. declaration dropped.

note "declaration dropped." @ end. means browser doesn't understand rule , hence doesn't assign background color element.

the valid keywords listed in specification:

the list of color keywords is: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, orange, purple, red, silver, teal, white, , yellow.