if (me.constrain || me.constrainHeader) {
el = me.constrainHeader ? me.header.el : me.el;
constrainTo = constrainTo || (me.floatParent && me.floatParent.getTargetEl()) || me.container;
if (me.constrain || me.constrainHeader) {
el = me.constrainHeader ? me.header.el : me.el;
constrainTo = constrainTo || (me.floatParent && me.floatParent.getTargetEl()) || me.container;