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Getting id of Clicked Element
You can use 'event.target.id' or 'this.id' to obtain the id of the clicked element.
RESETRUNFULL
<img id="product1" src="product1.png"
onclick="toProductPage(event)"/><script>
function toProductPage(event){
location="product.php?id="+event.target.id;
}</script>
<img id="product1" src="product1.png"
onclick="location='product.php?id='+this.id"/>