If your bootloader wasn't unlocked, I don't see how you could have bricked it. Also, do you know if you had usb debug mode turned on? You couldn't have flashed an image with a locked bootloader and the scripts won't work either since the adb/fastboot utilities cannot talk to your phone if debug mode is off.
At any rate, pull out the battery for a few minutes, reseat the battery, connect the phone to your pc, hold down vol- and power and see if you can get to a bootloader screen. Even if it seems to boot but hangs at the green htc logo, you should still be able to issue adb commands and recover.
Once the phone boots, on your pc, open a command prompt and type the command "adb devices" without quotes to see if your phone is recognized. Let us know the status then.