To adjust the picture size banned. change the number in var var W and H.
var var for H height and width for W.
for example
we change the width with 300 and height 150. change the value of var W with 300 and became var W = 300
and height to 150 and become var H = 150 the result will be like below image around

example 2. high become 600 and wide become 200
var H=600 and var W=200

example 3. high become 200 and wide become 600
var H=200 and var W=600

You can resize images as you wish but remember to resize the image to be proportional to the picture does not look odd