if (document.images) {
welcome_over = new Image
welcome_def = new Image
welcome_up = new Image

about_over = new Image
about_def = new Image
about_up = new Image

news_over = new Image
news_def = new Image
news_up = new Image

gallery_over = new Image
gallery_def = new Image
gallery_up = new Image

dane_over = new Image
dane_def = new Image
dane_up = new Image

sales_over = new Image
sales_def = new Image
sales_up = new Image

contact_over = new Image
contact_def = new Image
contact_up = new Image

welcome_over.src = "./data_source/welcome-over.jpg"
welcome_def.src = "./data_source/welcome-up.jpg"
welcome_up.src = "./data_source/welcome-up.jpg"

about_over.src = "./data_source/about-over.jpg"
about_def.src = "./data_source/about-up.jpg"
about_up.src = "./data_source/about-up.jpg"

news_over.src = "./data_source/news-over.jpg"
news_def.src = "./data_source/news-up.jpg"
news_up.src = "./data_source/news-up.jpg"

gallery_over.src = "./data_source/gallery-over.jpg"
gallery_def.src = "./data_source/gallery-up.jpg"
gallery_up.src = "./data_source/gallery-up.jpg"

dane_over.src = "./data_source/dane-over.jpg"
dane_def.src = "./data_source/dane-up.jpg"
dane_up.src = "./data_source/dane-up.jpg"

sales_over.src = "./data_source/sales-over.jpg"
sales_def.src = "./data_source/sales-up.jpg"
sales_up.src = "./data_source/sales-up.jpg"

contact_over.src = "./data_source/contact-over.jpg"
contact_def.src = "./data_source/contact-up.jpg"
contact_up.src = "./data_source/contact-up.jpg"

}
else{
welcome_over = ""
welcome_def = ""
welcome_up = ""

document.roll = ""
document.roll2 = ""
document.roll3 = ""
document.roll4 = ""
document.roll5 = ""
document.roll6 = ""
document.roll7 = ""
}