Run script and request root password

hi everyone. Ok i have a question to ask. I have a .sh script written for kdialog. The file runs fine when i run it through terminal as root. I'm only requesting root privileges so i can install a .deb file. I have wget setup to download the file but I'd love to know if there's a way to get the script to ask me for the root password to install said .deb file? To be honest this question doesn't make full sense to me but i thought I'd ask anyway.