Javascript

first time programming in java script. need help. there must be several errors in this script:

var x = 0
var y = 0

onMousedown="shop.src='./assets/images/shop3.png';"
onMouseup="shop.src='./assets/images/shop4.png';
var x = 1; var y = 1;"
onMouseout="if (x == 1) {
shop.src='./assets/images/shop4.png';
} else {
"shop.scr='./assets/images/shop1.png';" }"
 
onMouseover="if (y == 1) {
shop.src='./assets/images/shop3.jpg';
} else {
shop.src='./assets/images/shop2.png';" }"

onMousedown="aaa.src='./assets/images/aaa.png';"
onMousedown="supp.src='./assets/images/support1.png';"