if (document.images)
   {
    //home  
     image_over1= new Image(157,45);
     image_over1.src="Images/btn_home_over.gif";

     image_out1= new Image(157,45);
     image_out1.src="Images/btn_home.gif";
	 
	 //company profile
	 image_over2= new Image(157,45);
     image_over2.src="Images/btn_companyprofile_over.gif";

     image_out2= new Image(157,45);
     image_out2.src="Images/btn_companyprofile.gif";
	 
	 //customers
	 image_over3= new Image(157,45);
     image_over3.src="Images/btn_customers_over.gif";

     image_out3= new Image(157,45);
     image_out3.src="Images/btn_customers.gif";
	 
	 //expertise
	 image_over4= new Image(157,45);
     image_over4.src="Images/btn_expertise_over.gif";

     image_out4= new Image(157,45);
     image_out4.src="Images/btn_expertise.gif";
	 
	 //analysis
	 image_over5= new Image(157,45);
     image_over5.src="Images/btn_analysis_over.gif";

     image_out5= new Image(157,45);
     image_out5.src="Images/btn_analysis.gif";
	 
	 //experience
	 image_over6= new Image(157,45);
     image_over6.src="Images/btn_experience_over.gif";

     image_out6= new Image(157,45);
     image_out6.src="Images/btn_experience.gif";
	 
	 //contact us
	 image_over7= new Image(157,45);
     image_over7.src="Images/btn_contactus_over.gif";

     image_out7= new Image(157,45);
     image_out7.src="Images/btn_contactus.gif";
   }	
	
	
	
 function swap(image,mode)
   {
    
     image.src = eval("image_" + mode + ".src");

   }