The jQuery UI slider has option named “value”, which can be used to set the value of the slider.
	
//Code Starts
$(document).ready(function()
{ 
   var iValue = 18;
   $("#lbl").text(iValue);
   $("#slider").slider(
   {
     min:0,
     max:100,
     value:iValue,
     slide:function(event,ui)
     {
       $("#lbl").text(ui.value);
     }
  });
});
//Code Ends