javascript - Round number to nearest thousand, up or down depending on the number -

i want round number nearest thousand, @ moment i'm using this:

math.ceil(value/1000)*1000; 

but goes up, if type 1001 go 2000, want go or down depeding on number, example 1001 goes 1000 or 1400 goes 1000 1500 goes 2000

edit:

if(value<1000){   value = 1000; }else{   value = math.round(value/1000)*1000; } 

this want:

math.round(value/1000)*1000 

examples:

math.round(1001/1000)*1000 1000 math.round(1004/1000)*1000 1000 math.round(1500/1000)*1000 2000