For something like the example you are telling you can do something like this:
;Sample demo of clicking on a image and having a text displayed ;it's not a well writed code but it's only for demostration pourpose... Graphics 640,480,32,2 ;this command tell Blitz to open a screen 640*480 (the screen resolution),32(the screen colour depht),2(i use the windowed mode... ;1 is fullscreen and 3 is scalable window) SetBuffer BackBuffer() ;this will tell Blitz to make all the drawing command into the backbuffer...this allows double buffering technique (page flipping ;flicker free display...) ;now i load some graphic...you could load your graphic,just remember to place the bitmap in the same folder of you place ;this snippet of code... image1=LoadImage("image.bmp") ;this tell blitz to load an image and the image "handle" is image1 (for processing later the image..) sprite1=LoadImage("sprite1.bmp") ;now we load a simple sprite to move across the screen While Not KeyHit(1)=True ;the program repeat itself until the ESC key is pressed) Cls ;this clear the screen...for double buffering DrawImage (image1,300,300,0) ;this tell blitz to draw the image at 300*300 coordinates and to display frame 0 because we have loaded ;a single frame...) DrawImage (sprite1,MouseX(),MouseY(),0) ;this tell blitz to draw the sprite at mousex&y position,so every cycle the sprite ;change it's position as you move the mouse) If ImagesOverlap(sprite1,MouseX(),MouseY(),image1,300,300) And MouseDown(1)=True ;this is the most important part of the code.. ;pratically tell blitz to see if the two image are overlapping each other at their respective positionit's the called collision ;checking..)and i add another condition using the boolean operator AND...so if the 2 images overlap each other AND the mousebutton 1 ;is held down you achieve what you put AFTER the condition...(i hope i have explained well enough..) Text 200,200,"You are touching me....i'm shy please stop!!!" Else Text 150,150,"Haaa....this is much better... :)" EndIf ;this end the condition-checking Flip True ;this will tell blitz to swap the front-buffer and the back-buffer so you have flicker-free image display Wend End ;stop the program and exit to windows