Required library edition:
Required library file: dhtmlxtoolbar.js
adds a slider to webbar
id - id of a slider
pos - position of a slider
len - length (width) of a slider (px)
valueMin - minimal available value of a slider
valueMax - maximal available value of a slider
valueNow - initial current value of a slider
textMin - label for minimal value side (on the left side)
textMax - label for maximal value side (on the right side)
tip - tooltip template (%v will replaced with current value)
toolbar.addSlider(id, pos, len, valueMin, valueMax, valueNow, textMin, textMax, tip);