html - How to use JavaScript to scale an image to fit -

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i have 67x67 px image scale down 45x45 fit anchor not know how adjust it. html is:

<a class="compareprofilepic" id="compareprofilepic1" href="#">    <span id="compareprofilepicactionbtn1" class="autocenter">    </span> </a>

my css is:

a.compareprofilepic {    height: 45px;    width: 45px;    border-radius: 50%;    float: left;    margin-right: 10px;    cursor: default !important; }

and js is:

document.getelementbyid('compareprofilepic1').style.csstext = 'background-image: url(img/pic1.jpg)';

all searches led changing size of holding image, needs stay 45x45. suggestiosn on how scale image size?

thanks tips or pointers.

take here:

i used 

document.getelementbyid('compareprofilepic1').style.backgroundsize = "45px 45px";

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