Right well ive almost finished my website for solving quadratic equations and plotting it on a graph, however i am stuck on a small part to do with validation.
I want an image to display if the user has entered an incorrect value into the text box (i.e not a number), this is a Tick or a cross depending on whats right, ive got the if statements and stuff working but i cant remember how to actually set the image to be invisible.
Anyone know the line of code needed for this? Using VB/HTML, any helps appreciated!


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